diff --git a/services/surfaceflinger/tests/SurfaceInterceptor_test.cpp b/services/surfaceflinger/tests/SurfaceInterceptor_test.cpp
index 0cc763c..ed806b8 100644
--- a/services/surfaceflinger/tests/SurfaceInterceptor_test.cpp
+++ b/services/surfaceflinger/tests/SurfaceInterceptor_test.cpp
@@ -22,10 +22,11 @@
 #include <android/native_window.h>
 
 #include <gui/ISurfaceComposer.h>
+#include <gui/LayerState.h>
 #include <gui/Surface.h>
 #include <gui/SurfaceComposerClient.h>
+
 #include <private/gui/ComposerService.h>
-#include <private/gui/LayerState.h>
 #include <ui/DisplayInfo.h>
 
 #include <fstream>
@@ -34,6 +35,8 @@
 
 namespace android {
 
+using Transaction = SurfaceComposerClient::Transaction;
+
 constexpr int32_t SCALING_UPDATE = 1;
 constexpr uint32_t BUFFER_UPDATES = 18;
 constexpr uint32_t LAYER_UPDATE = INT_MAX - 2;
@@ -149,11 +152,11 @@
         ASSERT_TRUE(mBGSurfaceControl->isValid());
         mBGLayerId = getSurfaceId("BG Interceptor Test Surface");
 
-        SurfaceComposerClient::openGlobalTransaction();
-        mComposerClient->setDisplayLayerStack(display, 0);
-        ASSERT_EQ(NO_ERROR, mBGSurfaceControl->setLayer(INT_MAX-3));
-        ASSERT_EQ(NO_ERROR, mBGSurfaceControl->show());
-        SurfaceComposerClient::closeGlobalTransaction(true);
+        Transaction t;
+        t.setDisplayLayerStack(display, 0);
+        ASSERT_EQ(NO_ERROR, t.setLayer(mBGSurfaceControl, INT_MAX-3)
+                .show(mBGSurfaceControl)
+                .apply());
     }
 
     virtual void TearDown() {
@@ -169,13 +172,14 @@
     int32_t mTargetId;
 
 public:
-    void captureTest(void (SurfaceInterceptorTest::* action)(void),
+    void captureTest(void (SurfaceInterceptorTest::* action)(Transaction&),
             bool (SurfaceInterceptorTest::* verification)(Trace *));
-    void captureTest(void (SurfaceInterceptorTest::* action)(void),
+    void captureTest(void (SurfaceInterceptorTest::* action)(Transaction&),
             SurfaceChange::SurfaceChangeCase changeCase);
-    void captureTest(void (SurfaceInterceptorTest::* action)(void),
+    void captureTest(void (SurfaceInterceptorTest::* action)(Transaction&),
             Increment::IncrementCase incrementCase);
-    void runInTransaction(void (SurfaceInterceptorTest::* action)(void), bool intercepted = false);
+    void runInTransaction(void (SurfaceInterceptorTest::* action)(Transaction&),
+            bool intercepted = false);
 
     // Verification of changes to a surface
     bool positionUpdateFound(const SurfaceChange& change, bool foundPosition);
@@ -206,28 +210,29 @@
     bool bufferUpdatesFound(Trace* trace);
 
     // Perform each of the possible changes to a surface
-    void positionUpdate();
-    void sizeUpdate();
-    void alphaUpdate();
-    void layerUpdate();
-    void cropUpdate();
-    void finalCropUpdate();
-    void matrixUpdate();
-    void overrideScalingModeUpdate();
-    void transparentRegionHintUpdate();
-    void layerStackUpdate();
-    void hiddenFlagUpdate();
-    void opaqueFlagUpdate();
-    void secureFlagUpdate();
-    void deferredTransactionUpdate();
-    void runAllUpdates();
-    void surfaceCreation();
+    void positionUpdate(Transaction&);
+    void sizeUpdate(Transaction&);
+    void alphaUpdate(Transaction&);
+    void layerUpdate(Transaction&);
+    void cropUpdate(Transaction&);
+    void finalCropUpdate(Transaction&);
+    void matrixUpdate(Transaction&);
+    void overrideScalingModeUpdate(Transaction&);
+    void transparentRegionHintUpdate(Transaction&);
+    void layerStackUpdate(Transaction&);
+    void hiddenFlagUpdate(Transaction&);
+    void opaqueFlagUpdate(Transaction&);
+    void secureFlagUpdate(Transaction&);
+    void deferredTransactionUpdate(Transaction&);
+    void surfaceCreation(Transaction&);
+    void displayCreation(Transaction&);
+    void displayDeletion(Transaction&);
+
     void nBufferUpdates();
-    void displayCreation();
-    void displayDeletion();
+    void runAllUpdates();
 };
 
-void SurfaceInterceptorTest::captureTest(void (SurfaceInterceptorTest::* action)(void),
+void SurfaceInterceptorTest::captureTest(void (SurfaceInterceptorTest::* action)(Transaction&),
         bool (SurfaceInterceptorTest::* verification)(Trace *))
 {
     runInTransaction(action, true);
@@ -236,7 +241,7 @@
     ASSERT_TRUE((this->*verification)(&capturedTrace));
 }
 
-void SurfaceInterceptorTest::captureTest(void (SurfaceInterceptorTest::* action)(void),
+void SurfaceInterceptorTest::captureTest(void (SurfaceInterceptorTest::* action)(Transaction&),
         Increment::IncrementCase incrementCase)
 {
     runInTransaction(action, true);
@@ -245,7 +250,7 @@
     ASSERT_TRUE(singleIncrementFound(&capturedTrace, incrementCase));
 }
 
-void SurfaceInterceptorTest::captureTest(void (SurfaceInterceptorTest::* action)(void),
+void SurfaceInterceptorTest::captureTest(void (SurfaceInterceptorTest::* action)(Transaction&),
         SurfaceChange::SurfaceChangeCase changeCase)
 {
     runInTransaction(action, true);
@@ -254,83 +259,84 @@
     ASSERT_TRUE(surfaceUpdateFound(&capturedTrace, changeCase));
 }
 
-void SurfaceInterceptorTest::runInTransaction(void (SurfaceInterceptorTest::* action)(void),
+void SurfaceInterceptorTest::runInTransaction(void (SurfaceInterceptorTest::* action)(Transaction&),
         bool intercepted)
 {
     if (intercepted) {
         enableInterceptor();
     }
-    SurfaceComposerClient::openGlobalTransaction();
-    (this->*action)();
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    Transaction t;
+    (this->*action)(t);
+    t.apply(true);
+
     if (intercepted) {
         disableInterceptor();
     }
 }
 
-void SurfaceInterceptorTest::positionUpdate() {
-    mBGSurfaceControl->setPosition(POSITION_UPDATE, POSITION_UPDATE);
+void SurfaceInterceptorTest::positionUpdate(Transaction& t) {
+    t.setPosition(mBGSurfaceControl, POSITION_UPDATE, POSITION_UPDATE);
 }
 
-void SurfaceInterceptorTest::sizeUpdate() {
-    mBGSurfaceControl->setSize(SIZE_UPDATE, SIZE_UPDATE);
+void SurfaceInterceptorTest::sizeUpdate(Transaction& t) {
+    t.setSize(mBGSurfaceControl, SIZE_UPDATE, SIZE_UPDATE);
 }
 
-void SurfaceInterceptorTest::alphaUpdate() {
-    mBGSurfaceControl->setAlpha(ALPHA_UPDATE);
+void SurfaceInterceptorTest::alphaUpdate(Transaction& t) {
+    t.setAlpha(mBGSurfaceControl, ALPHA_UPDATE);
 }
 
-void SurfaceInterceptorTest::layerUpdate() {
-    mBGSurfaceControl->setLayer(LAYER_UPDATE);
+void SurfaceInterceptorTest::layerUpdate(Transaction& t) {
+    t.setLayer(mBGSurfaceControl, LAYER_UPDATE);
 }
 
-void SurfaceInterceptorTest::cropUpdate() {
-    mBGSurfaceControl->setCrop(CROP_UPDATE);
+void SurfaceInterceptorTest::cropUpdate(Transaction& t) {
+    t.setCrop(mBGSurfaceControl, CROP_UPDATE);
 }
 
-void SurfaceInterceptorTest::finalCropUpdate() {
-    mBGSurfaceControl->setFinalCrop(CROP_UPDATE);
+void SurfaceInterceptorTest::finalCropUpdate(Transaction& t) {
+    t.setFinalCrop(mBGSurfaceControl, CROP_UPDATE);
 }
 
-void SurfaceInterceptorTest::matrixUpdate() {
-    mBGSurfaceControl->setMatrix(M_SQRT1_2, M_SQRT1_2, -M_SQRT1_2, M_SQRT1_2);
+void SurfaceInterceptorTest::matrixUpdate(Transaction& t) {
+    t.setMatrix(mBGSurfaceControl, M_SQRT1_2, M_SQRT1_2, -M_SQRT1_2, M_SQRT1_2);
 }
 
-void SurfaceInterceptorTest::overrideScalingModeUpdate() {
-    mBGSurfaceControl->setOverrideScalingMode(SCALING_UPDATE);
+void SurfaceInterceptorTest::overrideScalingModeUpdate(Transaction& t) {
+    t.setOverrideScalingMode(mBGSurfaceControl, SCALING_UPDATE);
 }
 
-void SurfaceInterceptorTest::transparentRegionHintUpdate() {
+void SurfaceInterceptorTest::transparentRegionHintUpdate(Transaction& t) {
     Region region(CROP_UPDATE);
-    mBGSurfaceControl->setTransparentRegionHint(region);
+    t.setTransparentRegionHint(mBGSurfaceControl, region);
 }
 
-void SurfaceInterceptorTest::layerStackUpdate() {
-    mBGSurfaceControl->setLayerStack(STACK_UPDATE);
+void SurfaceInterceptorTest::layerStackUpdate(Transaction& t) {
+    t.setLayerStack(mBGSurfaceControl, STACK_UPDATE);
 }
 
-void SurfaceInterceptorTest::hiddenFlagUpdate() {
-    mBGSurfaceControl->setFlags(layer_state_t::eLayerHidden, layer_state_t::eLayerHidden);
+void SurfaceInterceptorTest::hiddenFlagUpdate(Transaction& t) {
+    t.setFlags(mBGSurfaceControl, layer_state_t::eLayerHidden, layer_state_t::eLayerHidden);
 }
 
-void SurfaceInterceptorTest::opaqueFlagUpdate() {
-    mBGSurfaceControl->setFlags(layer_state_t::eLayerOpaque, layer_state_t::eLayerOpaque);
+void SurfaceInterceptorTest::opaqueFlagUpdate(Transaction& t) {
+    t.setFlags(mBGSurfaceControl, layer_state_t::eLayerOpaque, layer_state_t::eLayerOpaque);
 }
 
-void SurfaceInterceptorTest::secureFlagUpdate() {
-    mBGSurfaceControl->setFlags(layer_state_t::eLayerSecure, layer_state_t::eLayerSecure);
+void SurfaceInterceptorTest::secureFlagUpdate(Transaction& t) {
+    t.setFlags(mBGSurfaceControl, layer_state_t::eLayerSecure, layer_state_t::eLayerSecure);
 }
 
-void SurfaceInterceptorTest::deferredTransactionUpdate() {
-    mBGSurfaceControl->deferTransactionUntil(mBGSurfaceControl->getHandle(), DEFERRED_UPDATE);
+void SurfaceInterceptorTest::deferredTransactionUpdate(Transaction& t) {
+    t.deferTransactionUntil(mBGSurfaceControl, mBGSurfaceControl->getHandle(), DEFERRED_UPDATE);
 }
 
-void SurfaceInterceptorTest::displayCreation() {
+void SurfaceInterceptorTest::displayCreation(Transaction&) {
     sp<IBinder> testDisplay = SurfaceComposerClient::createDisplay(DISPLAY_NAME, true);
     SurfaceComposerClient::destroyDisplay(testDisplay);
 }
 
-void SurfaceInterceptorTest::displayDeletion() {
+void SurfaceInterceptorTest::displayDeletion(Transaction&) {
     sp<IBinder> testDisplay = SurfaceComposerClient::createDisplay(DISPLAY_NAME, false);
     mTargetId = getDisplayId(DISPLAY_NAME.string());
     SurfaceComposerClient::destroyDisplay(testDisplay);
@@ -353,7 +359,7 @@
     runInTransaction(&SurfaceInterceptorTest::deferredTransactionUpdate);
 }
 
-void SurfaceInterceptorTest::surfaceCreation() {
+void SurfaceInterceptorTest::surfaceCreation(Transaction&) {
     mComposerClient->createSurface(String8(LAYER_NAME), SIZE_UPDATE, SIZE_UPDATE,
             PIXEL_FORMAT_RGBA_8888, 0);
 }
@@ -825,8 +831,10 @@
 }
 
 TEST_F(SurfaceInterceptorTest, InterceptBufferUpdateWorks) {
-    captureTest(&SurfaceInterceptorTest::nBufferUpdates,
-            &SurfaceInterceptorTest::bufferUpdatesFound);
+    nBufferUpdates();
+    Trace capturedTrace;
+    ASSERT_EQ(NO_ERROR, readProtoFile(&capturedTrace));
+    ASSERT_TRUE(bufferUpdatesFound(&capturedTrace));
 }
 
 // If the interceptor is enabled while buffer updates are being pushed, the interceptor should
diff --git a/services/surfaceflinger/tests/Transaction_test.cpp b/services/surfaceflinger/tests/Transaction_test.cpp
index d285785..f61a978 100644
--- a/services/surfaceflinger/tests/Transaction_test.cpp
+++ b/services/surfaceflinger/tests/Transaction_test.cpp
@@ -19,10 +19,11 @@
 #include <android/native_window.h>
 
 #include <gui/ISurfaceComposer.h>
+#include <gui/LayerState.h>
+
 #include <gui/Surface.h>
 #include <gui/SurfaceComposerClient.h>
 #include <private/gui/ComposerService.h>
-#include <private/gui/LayerState.h>
 
 #include <utils/String8.h>
 #include <ui/DisplayInfo.h>
@@ -30,8 +31,12 @@
 #include <math.h>
 #include <math/vec3.h>
 
+#include <functional>
+
 namespace android {
 
+using Transaction = SurfaceComposerClient::Transaction;
+
 // Fill an RGBA_8888 formatted surface with a single color.
 static void fillSurfaceRGBA8(const sp<SurfaceControl>& sc,
         uint8_t r, uint8_t g, uint8_t b, bool unlock=true) {
@@ -66,8 +71,8 @@
         sp<ISurfaceComposer> sf(ComposerService::getComposerService());
         sp<IBinder> display(sf->getBuiltInDisplay(
                 ISurfaceComposer::eDisplayIdMain));
-        SurfaceComposerClient::openGlobalTransaction();
-        SurfaceComposerClient::closeGlobalTransaction(true);
+        SurfaceComposerClient::Transaction().apply(true);
+
         ASSERT_EQ(NO_ERROR, sf->captureScreen(display, producer, Rect(), 0, 0,
                 0, INT_MAX, false));
         *sc = new ScreenCapture(cpuConsumer);
@@ -149,23 +154,21 @@
 
         fillSurfaceRGBA8(mSyncSurfaceControl, 31, 31, 31);
 
-        SurfaceComposerClient::openGlobalTransaction();
+        asTransaction([&](Transaction& t) {
+            t.setDisplayLayerStack(display, 0);
 
-        mComposerClient->setDisplayLayerStack(display, 0);
+            t.setLayer(mBGSurfaceControl, INT32_MAX-2)
+                .show(mBGSurfaceControl);
 
-        ASSERT_EQ(NO_ERROR, mBGSurfaceControl->setLayer(INT32_MAX-2));
-        ASSERT_EQ(NO_ERROR, mBGSurfaceControl->show());
+            t.setLayer(mFGSurfaceControl, INT32_MAX-1)
+                .setPosition(mFGSurfaceControl, 64, 64)
+                .show(mFGSurfaceControl);
 
-        ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setLayer(INT32_MAX-1));
-        ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setPosition(64, 64));
-        ASSERT_EQ(NO_ERROR, mFGSurfaceControl->show());
-
-        ASSERT_EQ(NO_ERROR, mSyncSurfaceControl->setLayer(INT32_MAX-1));
-        ASSERT_EQ(NO_ERROR, mSyncSurfaceControl->setPosition(displayWidth-2,
-                displayHeight-2));
-        ASSERT_EQ(NO_ERROR, mSyncSurfaceControl->show());
-
-        SurfaceComposerClient::closeGlobalTransaction(true);
+            t.setLayer(mSyncSurfaceControl, INT32_MAX-1)
+                .setPosition(mSyncSurfaceControl, displayWidth-2,
+                        displayHeight-2)
+                .show(mSyncSurfaceControl);
+        });
     }
 
     virtual void TearDown() {
@@ -186,6 +189,12 @@
         fillSurfaceRGBA8(mSyncSurfaceControl, 31, 31, 31);
     }
 
+    void asTransaction(const std::function<void(Transaction&)>& exec) {
+        Transaction t;
+        exec(t);
+        t.apply(true);
+    }
+
     sp<SurfaceComposerClient> mComposerClient;
     sp<SurfaceControl> mBGSurfaceControl;
     sp<SurfaceControl> mFGSurfaceControl;
@@ -205,9 +214,10 @@
         sc->expectBGColor(145, 145);
     }
 
-    SurfaceComposerClient::openGlobalTransaction();
-    ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setPosition(128, 128));
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setPosition(mFGSurfaceControl, 128, 128);
+    });
+
     {
         // This should reflect the new position, but not the new color.
         SCOPED_TRACE("after move, before redraw");
@@ -240,9 +250,9 @@
     }
 
     ALOGD("resizing");
-    SurfaceComposerClient::openGlobalTransaction();
-    ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setSize(128, 128));
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setSize(mFGSurfaceControl, 128, 128);
+    });
     ALOGD("resized");
     {
         // This should not reflect the new size or color because SurfaceFlinger
@@ -278,10 +288,10 @@
         sc->expectBGColor(145, 145);
     }
 
-    SurfaceComposerClient::openGlobalTransaction();
-    Rect cropRect(16, 16, 32, 32);
-    ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setCrop(cropRect));
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        Rect cropRect(16, 16, 32, 32);
+        t.setCrop(mFGSurfaceControl, cropRect);
+    });
     {
         // This should crop the foreground surface.
         SCOPED_TRACE("after crop");
@@ -303,10 +313,10 @@
         sc->expectFGColor(75, 75);
         sc->expectBGColor(145, 145);
     }
-    SurfaceComposerClient::openGlobalTransaction();
-    Rect cropRect(16, 16, 32, 32);
-    ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setFinalCrop(cropRect));
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        Rect cropRect(16, 16, 32, 32);
+        t.setFinalCrop(mFGSurfaceControl, cropRect);
+    });
     {
         // This should crop the foreground surface.
         SCOPED_TRACE("after crop");
@@ -329,9 +339,10 @@
         sc->expectBGColor(145, 145);
     }
 
-    SurfaceComposerClient::openGlobalTransaction();
-    ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setLayer(INT_MAX - 3));
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setLayer(mFGSurfaceControl, INT_MAX - 3);
+    });
+
     {
         // This should hide the foreground surface beneath the background.
         SCOPED_TRACE("after setLayer");
@@ -352,9 +363,10 @@
         sc->expectBGColor(145, 145);
     }
 
-    SurfaceComposerClient::openGlobalTransaction();
-    ASSERT_EQ(NO_ERROR, mFGSurfaceControl->hide());
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.hide(mFGSurfaceControl);
+    });
+
     {
         // This should hide the foreground surface.
         SCOPED_TRACE("after hide, before show");
@@ -364,9 +376,10 @@
         sc->expectBGColor(145, 145);
     }
 
-    SurfaceComposerClient::openGlobalTransaction();
-    ASSERT_EQ(NO_ERROR, mFGSurfaceControl->show());
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.show(mFGSurfaceControl);
+    });
+
     {
         // This should show the foreground surface.
         SCOPED_TRACE("after show");
@@ -387,9 +400,10 @@
         sc->expectBGColor(145, 145);
     }
 
-    SurfaceComposerClient::openGlobalTransaction();
-    ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setAlpha(0.75f));
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setAlpha(mFGSurfaceControl, 0.75f);
+    });
+
     {
         // This should set foreground to be 75% opaque.
         SCOPED_TRACE("after setAlpha");
@@ -410,9 +424,9 @@
         sc->expectBGColor(145, 145);
     }
 
-    SurfaceComposerClient::openGlobalTransaction();
-    ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setLayerStack(1));
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setLayerStack(mFGSurfaceControl, 1);
+    });
     {
         // This should hide the foreground surface since it goes to a different
         // layer stack.
@@ -434,10 +448,10 @@
         sc->expectBGColor(145, 145);
     }
 
-    SurfaceComposerClient::openGlobalTransaction();
-    ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setFlags(
-            layer_state_t::eLayerHidden, layer_state_t::eLayerHidden));
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+          t.setFlags(mFGSurfaceControl,
+                layer_state_t::eLayerHidden, layer_state_t::eLayerHidden);
+    });
     {
         // This should hide the foreground surface
         SCOPED_TRACE("after setFlags");
@@ -459,10 +473,11 @@
         sc->expectBGColor(145, 145);
     }
 
-    SurfaceComposerClient::openGlobalTransaction();
-    ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setMatrix(M_SQRT1_2, M_SQRT1_2,
-            -M_SQRT1_2, M_SQRT1_2));
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setMatrix(mFGSurfaceControl,
+                M_SQRT1_2, M_SQRT1_2,
+                -M_SQRT1_2, M_SQRT1_2);
+    });
     {
         SCOPED_TRACE("after setMatrix");
         ScreenCapture::captureScreen(&sc);
@@ -498,12 +513,12 @@
         waitForPostedBuffers();
     }
     void restoreInitialState() {
-        SurfaceComposerClient::openGlobalTransaction();
-        mFGSurfaceControl->setSize(64, 64);
-        mFGSurfaceControl->setPosition(64, 64);
-        mFGSurfaceControl->setCrop(Rect(0, 0, 64, 64));
-        mFGSurfaceControl->setFinalCrop(Rect(0, 0, -1, -1));
-        SurfaceComposerClient::closeGlobalTransaction(true);
+        asTransaction([&](Transaction& t) {
+            t.setSize(mFGSurfaceControl, 64, 64);
+            t.setPosition(mFGSurfaceControl, 64, 64);
+            t.setCrop(mFGSurfaceControl, Rect(0, 0, 64, 64));
+            t.setFinalCrop(mFGSurfaceControl, Rect(0, 0, -1, -1));
+        });
 
         EXPECT_INITIAL_STATE("After restoring initial state");
     }
@@ -515,10 +530,10 @@
 
     // By default position can be updated even while
     // a resize is pending.
-    SurfaceComposerClient::openGlobalTransaction();
-    mFGSurfaceControl->setSize(32, 32);
-    mFGSurfaceControl->setPosition(100, 100);
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setSize(mFGSurfaceControl, 32, 32);
+        t.setPosition(mFGSurfaceControl, 100, 100);
+    });
 
     {
         SCOPED_TRACE("After moving surface");
@@ -532,11 +547,11 @@
 
     // Now we repeat with setGeometryAppliesWithResize
     // and verify the position DOESN'T latch.
-    SurfaceComposerClient::openGlobalTransaction();
-    mFGSurfaceControl->setGeometryAppliesWithResize();
-    mFGSurfaceControl->setSize(32, 32);
-    mFGSurfaceControl->setPosition(100, 100);
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setGeometryAppliesWithResize(mFGSurfaceControl);
+        t.setSize(mFGSurfaceControl, 32, 32);
+        t.setPosition(mFGSurfaceControl, 100, 100);
+    });
 
     {
         SCOPED_TRACE("While resize is pending");
@@ -581,20 +596,20 @@
 TEST_F(CropLatchingTest, CropLatching) {
     EXPECT_INITIAL_STATE("before anything");
     // Normally the crop applies immediately even while a resize is pending.
-    SurfaceComposerClient::openGlobalTransaction();
-    mFGSurfaceControl->setSize(128, 128);
-    mFGSurfaceControl->setCrop(Rect(0, 0, 63, 63));
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setSize(mFGSurfaceControl, 128, 128);
+        t.setCrop(mFGSurfaceControl, Rect(0, 0, 63, 63));
+    });
 
     EXPECT_CROPPED_STATE("after setting crop (without geometryAppliesWithResize)");
 
     restoreInitialState();
 
-    SurfaceComposerClient::openGlobalTransaction();
-    mFGSurfaceControl->setSize(128, 128);
-    mFGSurfaceControl->setGeometryAppliesWithResize();
-    mFGSurfaceControl->setCrop(Rect(0, 0, 63, 63));
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setSize(mFGSurfaceControl, 128, 128);
+        t.setGeometryAppliesWithResize(mFGSurfaceControl);
+        t.setCrop(mFGSurfaceControl, Rect(0, 0, 63, 63));
+    });
 
     EXPECT_INITIAL_STATE("after setting crop (with geometryAppliesWithResize)");
 
@@ -606,20 +621,20 @@
 TEST_F(CropLatchingTest, FinalCropLatching) {
     EXPECT_INITIAL_STATE("before anything");
     // Normally the crop applies immediately even while a resize is pending.
-    SurfaceComposerClient::openGlobalTransaction();
-    mFGSurfaceControl->setSize(128, 128);
-    mFGSurfaceControl->setFinalCrop(Rect(64, 64, 127, 127));
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setSize(mFGSurfaceControl, 128, 128);
+        t.setFinalCrop(mFGSurfaceControl, Rect(64, 64, 127, 127));
+    });
 
     EXPECT_CROPPED_STATE("after setting crop (without geometryAppliesWithResize)");
 
     restoreInitialState();
 
-    SurfaceComposerClient::openGlobalTransaction();
-    mFGSurfaceControl->setSize(128, 128);
-    mFGSurfaceControl->setGeometryAppliesWithResize();
-    mFGSurfaceControl->setFinalCrop(Rect(64, 64, 127, 127));
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setSize(mFGSurfaceControl, 128, 128);
+        t.setGeometryAppliesWithResize(mFGSurfaceControl);
+        t.setFinalCrop(mFGSurfaceControl, Rect(64, 64, 127, 127));
+    });
 
     EXPECT_INITIAL_STATE("after setting crop (with geometryAppliesWithResize)");
 
@@ -633,10 +648,10 @@
 TEST_F(CropLatchingTest, FinalCropLatchingBufferOldSize) {
     EXPECT_INITIAL_STATE("before anything");
     // Normally the crop applies immediately even while a resize is pending.
-    SurfaceComposerClient::openGlobalTransaction();
-    mFGSurfaceControl->setSize(128, 128);
-    mFGSurfaceControl->setFinalCrop(Rect(64, 64, 127, 127));
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setSize(mFGSurfaceControl, 128, 128);
+        t.setFinalCrop(mFGSurfaceControl, Rect(64, 64, 127, 127));
+    });
 
     EXPECT_CROPPED_STATE("after setting crop (without geometryAppliesWithResize)");
 
@@ -646,11 +661,11 @@
     // initiating the resize.
     lockAndFillFGBuffer();
 
-    SurfaceComposerClient::openGlobalTransaction();
-    mFGSurfaceControl->setSize(128, 128);
-    mFGSurfaceControl->setGeometryAppliesWithResize();
-    mFGSurfaceControl->setFinalCrop(Rect(64, 64, 127, 127));
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setSize(mFGSurfaceControl, 128, 128);
+        t.setGeometryAppliesWithResize(mFGSurfaceControl);
+        t.setFinalCrop(mFGSurfaceControl, Rect(64, 64, 127, 127));
+    });
 
     EXPECT_INITIAL_STATE("after setting crop (with geometryAppliesWithResize)");
 
@@ -670,17 +685,17 @@
     // In this scenario, we attempt to set the final crop a second time while the resize
     // is still pending, and ensure we are successful. Success meaning the second crop
     // is the one which eventually latches and not the first.
-    SurfaceComposerClient::openGlobalTransaction();
-    mFGSurfaceControl->setSize(128, 128);
-    mFGSurfaceControl->setGeometryAppliesWithResize();
-    mFGSurfaceControl->setFinalCrop(Rect(64, 64, 127, 127));
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setSize(mFGSurfaceControl, 128, 128);
+        t.setGeometryAppliesWithResize(mFGSurfaceControl);
+        t.setFinalCrop(mFGSurfaceControl, Rect(64, 64, 127, 127));
+    });
 
     EXPECT_INITIAL_STATE("after setting crops with geometryAppliesWithResize");
 
-    SurfaceComposerClient::openGlobalTransaction();
-    mFGSurfaceControl->setFinalCrop(Rect(0, 0, -1, -1));
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setFinalCrop(mFGSurfaceControl, Rect(0, 0, -1, -1));
+    });
 
     EXPECT_INITIAL_STATE("after setting another crop");
 
@@ -700,17 +715,17 @@
     }
 
     // set up two deferred transactions on different frames
-    SurfaceComposerClient::openGlobalTransaction();
-    ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setAlpha(0.75));
-    mFGSurfaceControl->deferTransactionUntil(mSyncSurfaceControl->getHandle(),
-            mSyncSurfaceControl->getSurface()->getNextFrameNumber());
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setAlpha(mFGSurfaceControl, 0.75);
+        t.deferTransactionUntil(mFGSurfaceControl, mSyncSurfaceControl->getHandle(),
+                mSyncSurfaceControl->getSurface()->getNextFrameNumber());
+    });
 
-    SurfaceComposerClient::openGlobalTransaction();
-    ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setPosition(128,128));
-    mFGSurfaceControl->deferTransactionUntil(mSyncSurfaceControl->getHandle(),
-            mSyncSurfaceControl->getSurface()->getNextFrameNumber() + 1);
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setPosition(mFGSurfaceControl, 128,128);
+        t.deferTransactionUntil(mFGSurfaceControl, mSyncSurfaceControl->getHandle(),
+                mSyncSurfaceControl->getSurface()->getNextFrameNumber() + 1);
+    });
 
     {
         SCOPED_TRACE("before any trigger");
@@ -731,9 +746,9 @@
     }
 
     // should show up immediately since it's not deferred
-    SurfaceComposerClient::openGlobalTransaction();
-    ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setAlpha(1.0));
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setAlpha(mFGSurfaceControl, 1.0);
+    });
 
     // trigger the second deferred transaction
     fillSurfaceRGBA8(mSyncSurfaceControl, 31, 31, 31);
@@ -762,12 +777,11 @@
     waitForPostedBuffers();
 
     // Now we stack the surface above the foreground surface and make sure it is visible.
-    SurfaceComposerClient::openGlobalTransaction();
-    relativeSurfaceControl->setPosition(64, 64);
-    relativeSurfaceControl->show();
-    relativeSurfaceControl->setRelativeLayer(mFGSurfaceControl->getHandle(), 1);
-    SurfaceComposerClient::closeGlobalTransaction(true);
-
+    asTransaction([&](Transaction& t) {
+        t.setPosition(relativeSurfaceControl, 64, 64);
+        t.show(relativeSurfaceControl);
+        t.setRelativeLayer(relativeSurfaceControl, mFGSurfaceControl->getHandle(), 1);
+    });
 
     {
         SCOPED_TRACE("after adding relative surface");
@@ -777,9 +791,9 @@
     }
 
     // A call to setLayer will override a call to setRelativeLayer
-    SurfaceComposerClient::openGlobalTransaction();
-    relativeSurfaceControl->setLayer(0);
-    SurfaceComposerClient::closeGlobalTransaction();
+    asTransaction([&](Transaction& t) {
+        t.setLayer(relativeSurfaceControl, 0);
+    });
 
     {
         SCOPED_TRACE("after set layer");
@@ -801,11 +815,10 @@
             PIXEL_FORMAT_RGBA_8888, 0, childNoBuffer.get());
     fillSurfaceRGBA8(childBuffer, 200, 200, 200);
 
-    SurfaceComposerClient::openGlobalTransaction();
-    childNoBuffer->show();
-    childBuffer->show();
-    SurfaceComposerClient::closeGlobalTransaction();
-
+    SurfaceComposerClient::Transaction{}
+            .show(childNoBuffer)
+            .show(childBuffer)
+            .apply(true);
 
     {
         ScreenCapture::captureScreen(&sc);
@@ -813,9 +826,9 @@
         sc->expectFGColor(74, 74);
     }
 
-    SurfaceComposerClient::openGlobalTransaction();
-    childNoBuffer->setSize(20, 20);
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    SurfaceComposerClient::Transaction{}
+            .setSize(childNoBuffer, 20, 20)
+            .apply(true);
 
     {
         ScreenCapture::captureScreen(&sc);
@@ -850,11 +863,11 @@
 };
 
 TEST_F(ChildLayerTest, ChildLayerPositioning) {
-    SurfaceComposerClient::openGlobalTransaction();
-    mChild->show();
-    mChild->setPosition(10, 10);
-    mFGSurfaceControl->setPosition(64, 64);
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.show(mChild);
+        t.setPosition(mChild, 10, 10);
+        t.setPosition(mFGSurfaceControl, 64, 64);
+    });
 
     {
         ScreenCapture::captureScreen(&mCapture);
@@ -866,9 +879,9 @@
         mCapture->expectFGColor(84, 84);
     }
 
-    SurfaceComposerClient::openGlobalTransaction();
-    ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setPosition(0, 0));
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setPosition(mFGSurfaceControl, 0, 0);
+    });
 
     {
         ScreenCapture::captureScreen(&mCapture);
@@ -882,12 +895,12 @@
 }
 
 TEST_F(ChildLayerTest, ChildLayerCropping) {
-    SurfaceComposerClient::openGlobalTransaction();
-    mChild->show();
-    mChild->setPosition(0, 0);
-    mFGSurfaceControl->setPosition(0, 0);
-    mFGSurfaceControl->setCrop(Rect(0, 0, 5, 5));
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.show(mChild);
+        t.setPosition(mChild, 0, 0);
+        t.setPosition(mFGSurfaceControl, 0, 0);
+        t.setCrop(mFGSurfaceControl, Rect(0, 0, 5, 5));
+    });
 
     {
         ScreenCapture::captureScreen(&mCapture);
@@ -898,12 +911,12 @@
 }
 
 TEST_F(ChildLayerTest, ChildLayerFinalCropping) {
-    SurfaceComposerClient::openGlobalTransaction();
-    mChild->show();
-    mChild->setPosition(0, 0);
-    mFGSurfaceControl->setPosition(0, 0);
-    mFGSurfaceControl->setFinalCrop(Rect(0, 0, 5, 5));
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.show(mChild);
+        t.setPosition(mChild, 0, 0);
+        t.setPosition(mFGSurfaceControl, 0, 0);
+        t.setFinalCrop(mFGSurfaceControl, Rect(0, 0, 5, 5));
+    });
 
     {
         ScreenCapture::captureScreen(&mCapture);
@@ -914,11 +927,11 @@
 }
 
 TEST_F(ChildLayerTest, ChildLayerConstraints) {
-    SurfaceComposerClient::openGlobalTransaction();
-    mChild->show();
-    mFGSurfaceControl->setPosition(0, 0);
-    mChild->setPosition(63, 63);
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.show(mChild);
+        t.setPosition(mFGSurfaceControl, 0, 0);
+        t.setPosition(mChild, 63, 63);
+    });
 
     {
         ScreenCapture::captureScreen(&mCapture);
@@ -932,9 +945,9 @@
 }
 
 TEST_F(ChildLayerTest, ChildLayerScaling) {
-    SurfaceComposerClient::openGlobalTransaction();
-    mFGSurfaceControl->setPosition(0, 0);
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setPosition(mFGSurfaceControl, 0, 0);
+    });
 
     // Find the boundary between the parent and child
     {
@@ -943,9 +956,9 @@
         mCapture->expectFGColor(10, 10);
     }
 
-    SurfaceComposerClient::openGlobalTransaction();
-    mFGSurfaceControl->setMatrix(2.0, 0, 0, 2.0);
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setMatrix(mFGSurfaceControl, 2.0, 0, 0, 2.0);
+    });
 
     // The boundary should be twice as far from the origin now.
     // The pixels from the last test should all be child now
@@ -964,11 +977,11 @@
     fillSurfaceRGBA8(mChild, 0, 254, 0);
     waitForPostedBuffers();
 
-    SurfaceComposerClient::openGlobalTransaction();
-    mChild->show();
-    mChild->setPosition(0, 0);
-    mFGSurfaceControl->setPosition(0, 0);
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.show(mChild);
+        t.setPosition(mChild, 0, 0);
+        t.setPosition(mFGSurfaceControl, 0, 0);
+    });
 
     {
         ScreenCapture::captureScreen(&mCapture);
@@ -976,9 +989,9 @@
         mCapture->checkPixel(0, 0, 0, 254, 0);
     }
 
-    SurfaceComposerClient::openGlobalTransaction();
-    ASSERT_EQ(NO_ERROR, mChild->setAlpha(0.5));
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setAlpha(mChild, 0.5);
+    });
 
     {
         ScreenCapture::captureScreen(&mCapture);
@@ -986,9 +999,9 @@
         mCapture->checkPixel(0, 0, 127, 127, 0);
     }
 
-    SurfaceComposerClient::openGlobalTransaction();
-    ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setAlpha(0.5));
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.setAlpha(mFGSurfaceControl, 0.5);
+    });
 
     {
         ScreenCapture::captureScreen(&mCapture);
@@ -998,11 +1011,11 @@
 }
 
 TEST_F(ChildLayerTest, ReparentChildren) {
-    SurfaceComposerClient::openGlobalTransaction();
-    mChild->show();
-    mChild->setPosition(10, 10);
-    mFGSurfaceControl->setPosition(64, 64);
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.show(mChild);
+        t.setPosition(mChild, 10, 10);
+        t.setPosition(mFGSurfaceControl, 64, 64);
+    });
 
     {
         ScreenCapture::captureScreen(&mCapture);
@@ -1013,7 +1026,11 @@
         // And 10 more pixels we should be back to the foreground surface
         mCapture->expectFGColor(84, 84);
     }
-    mFGSurfaceControl->reparentChildren(mBGSurfaceControl->getHandle());
+
+    asTransaction([&](Transaction& t) {
+        t.reparentChildren(mFGSurfaceControl, mBGSurfaceControl->getHandle());
+    });
+
     {
         ScreenCapture::captureScreen(&mCapture);
         mCapture->expectFGColor(64, 64);
@@ -1027,11 +1044,11 @@
 }
 
 TEST_F(ChildLayerTest, DetachChildrenSameClient) {
-    SurfaceComposerClient::openGlobalTransaction();
-    mChild->show();
-    mChild->setPosition(10, 10);
-    mFGSurfaceControl->setPosition(64, 64);
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.show(mChild);
+        t.setPosition(mChild, 10, 10);
+        t.setPosition(mFGSurfaceControl, 64, 64);
+    });
 
     {
         ScreenCapture::captureScreen(&mCapture);
@@ -1043,13 +1060,13 @@
         mCapture->expectFGColor(84, 84);
     }
 
-    SurfaceComposerClient::openGlobalTransaction();
-    mFGSurfaceControl->detachChildren();
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.detachChildren(mFGSurfaceControl);
+    });
 
-    SurfaceComposerClient::openGlobalTransaction();
-    mChild->hide();
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.hide(mChild);
+    });
 
     // Since the child has the same client as the parent, it will not get
     // detached and will be hidden.
@@ -1072,12 +1089,12 @@
 
     fillSurfaceRGBA8(mChildNewClient, 200, 200, 200);
 
-    SurfaceComposerClient::openGlobalTransaction();
-    mChild->hide();
-    mChildNewClient->show();
-    mChildNewClient->setPosition(10, 10);
-    mFGSurfaceControl->setPosition(64, 64);
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.hide(mChild);
+        t.show(mChildNewClient);
+        t.setPosition(mChildNewClient, 10, 10);
+        t.setPosition(mFGSurfaceControl, 64, 64);
+    });
 
     {
         ScreenCapture::captureScreen(&mCapture);
@@ -1089,13 +1106,13 @@
         mCapture->expectFGColor(84, 84);
     }
 
-    SurfaceComposerClient::openGlobalTransaction();
-    mFGSurfaceControl->detachChildren();
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.detachChildren(mFGSurfaceControl);
+    });
 
-    SurfaceComposerClient::openGlobalTransaction();
-    mChildNewClient->hide();
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.hide(mChildNewClient);
+    });
 
     // Nothing should have changed.
     {
@@ -1107,11 +1124,11 @@
 }
 
 TEST_F(ChildLayerTest, ChildrenInheritNonTransformScalingFromParent) {
-    SurfaceComposerClient::openGlobalTransaction();
-    mChild->show();
-    mChild->setPosition(0, 0);
-    mFGSurfaceControl->setPosition(0, 0);
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.show(mChild);
+        t.setPosition(mChild, 0, 0);
+        t.setPosition(mFGSurfaceControl, 0, 0);
+    });
 
     {
         ScreenCapture::captureScreen(&mCapture);
@@ -1121,11 +1138,11 @@
         mCapture->expectFGColor(10, 10);
     }
 
-    SurfaceComposerClient::openGlobalTransaction();
-    mFGSurfaceControl->setOverrideScalingMode(NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW);
-    // We cause scaling by 2.
-    mFGSurfaceControl->setSize(128, 128);
-    SurfaceComposerClient::closeGlobalTransaction();
+    asTransaction([&](Transaction& t) {
+        t.setOverrideScalingMode(mFGSurfaceControl, NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW);
+        // We cause scaling by 2.
+        t.setSize(mFGSurfaceControl, 128, 128);
+    });
 
     {
         ScreenCapture::captureScreen(&mCapture);
@@ -1140,11 +1157,11 @@
 
 // Regression test for b/37673612
 TEST_F(ChildLayerTest, ChildrenWithParentBufferTransform) {
-    SurfaceComposerClient::openGlobalTransaction();
-    mChild->show();
-    mChild->setPosition(0, 0);
-    mFGSurfaceControl->setPosition(0, 0);
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.show(mChild);
+        t.setPosition(mChild, 0, 0);
+        t.setPosition(mFGSurfaceControl, 0, 0);
+    });
 
     {
         ScreenCapture::captureScreen(&mCapture);
@@ -1153,11 +1170,11 @@
         // But it's only 10x10.
         mCapture->expectFGColor(10, 10);
     }
-
-
     // We set things up as in b/37673612 so that there is a mismatch between the buffer size and
     // the WM specified state size.
-    mFGSurfaceControl->setSize(128, 64);
+    asTransaction([&](Transaction& t) {
+         t.setSize(mFGSurfaceControl, 128, 64);
+    });
     sp<Surface> s = mFGSurfaceControl->getSurface();
     auto anw = static_cast<ANativeWindow*>(s.get());
     native_window_set_buffers_transform(anw, NATIVE_WINDOW_TRANSFORM_ROT_90);
@@ -1184,11 +1201,11 @@
                                             mFGSurfaceControl.get());
 
     // Show the child layer in a deferred transaction
-    SurfaceComposerClient::openGlobalTransaction();
-    mChild->deferTransactionUntil(mFGSurfaceControl->getHandle(),
-                                  mFGSurfaceControl->getSurface()->getNextFrameNumber());
-    mChild->show();
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.deferTransactionUntil(mChild, mFGSurfaceControl->getHandle(),
+                mFGSurfaceControl->getSurface()->getNextFrameNumber());
+        t.show(mChild);
+    });
 
     // Render the foreground surface a few times
     //
@@ -1206,11 +1223,11 @@
 }
 
 TEST_F(ChildLayerTest, Reparent) {
-    SurfaceComposerClient::openGlobalTransaction();
-    mChild->show();
-    mChild->setPosition(10, 10);
-    mFGSurfaceControl->setPosition(64, 64);
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.show(mChild);
+        t.setPosition(mChild, 10, 10);
+        t.setPosition(mFGSurfaceControl, 64, 64);
+    });
 
     {
         ScreenCapture::captureScreen(&mCapture);
@@ -1221,7 +1238,11 @@
         // And 10 more pixels we should be back to the foreground surface
         mCapture->expectFGColor(84, 84);
     }
-    mChild->reparent(mBGSurfaceControl->getHandle());
+
+    asTransaction([&](Transaction& t) {
+        t.reparent(mChild, mBGSurfaceControl->getHandle());
+    });
+
     {
         ScreenCapture::captureScreen(&mCapture);
         mCapture->expectFGColor(64, 64);
@@ -1235,11 +1256,11 @@
 }
 
 TEST_F(ChildLayerTest, ReparentToNoParent) {
-    SurfaceComposerClient::openGlobalTransaction();
-    mChild->show();
-    mChild->setPosition(10, 10);
-    mFGSurfaceControl->setPosition(64, 64);
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.show(mChild);
+        t.setPosition(mChild, 10, 10);
+        t.setPosition(mFGSurfaceControl, 64, 64);
+    });
 
     {
         ScreenCapture::captureScreen(&mCapture);
@@ -1250,7 +1271,9 @@
         // And 10 more pixels we should be back to the foreground surface
         mCapture->expectFGColor(84, 84);
     }
-    mChild->reparent(nullptr);
+    asTransaction([&](Transaction& t) {
+        t.reparent(mChild, nullptr);
+    });
     {
         ScreenCapture::captureScreen(&mCapture);
         // Nothing should have changed.
@@ -1267,13 +1290,13 @@
     ASSERT_TRUE(newSurface->isValid());
 
     fillSurfaceRGBA8(newSurface, 63, 195, 63);
-    SurfaceComposerClient::openGlobalTransaction();
-    mChild->hide();
-    newSurface->show();
-    newSurface->setPosition(10, 10);
-    newSurface->setLayer(INT32_MAX-2);
-    mFGSurfaceControl->setPosition(64, 64);
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.hide(mChild);
+        t.show(newSurface);
+        t.setPosition(newSurface, 10, 10);
+        t.setLayer(newSurface, INT32_MAX-2);
+        t.setPosition(mFGSurfaceControl, 64, 64);
+    });
 
     {
         ScreenCapture::captureScreen(&mCapture);
@@ -1283,9 +1306,9 @@
         mCapture->checkPixel(10, 10, 63, 195, 63);
     }
 
-    SurfaceComposerClient::openGlobalTransaction();
-    newSurface->reparent(mFGSurfaceControl->getHandle());
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.reparent(newSurface, mFGSurfaceControl->getHandle());
+    });
 
     {
         ScreenCapture::captureScreen(&mCapture);
@@ -1325,12 +1348,12 @@
         ASSERT_TRUE(mLayerColorControl != NULL);
         ASSERT_TRUE(mLayerColorControl->isValid());
 
-        SurfaceComposerClient::openGlobalTransaction();
-        ASSERT_EQ(NO_ERROR, mLayerColorControl->setLayer(INT32_MAX-1));
-        ASSERT_EQ(NO_ERROR, mLayerColorControl->setPosition(140, 140));
-        ASSERT_EQ(NO_ERROR, mLayerColorControl->hide());
-        ASSERT_EQ(NO_ERROR, mFGSurfaceControl->hide());
-        SurfaceComposerClient::closeGlobalTransaction(true);
+        asTransaction([&](Transaction& t) {
+            t.setLayer(mLayerColorControl, INT32_MAX-1);
+            t.setPosition(mLayerColorControl, 140, 140);
+            t.hide(mLayerColorControl);
+            t.hide(mFGSurfaceControl);
+        });
     }
 
     void TearDown() override {
@@ -1350,15 +1373,16 @@
         sc->expectBGColor(145, 145);
     }
 
+    asTransaction([&](Transaction& t) {
+        half3 color(43.0f/255.0f, 207.0f/255.0f, 131.0f/255.0f);
+        t.setColor(mLayerColorControl, color);
+        t.show(mLayerColorControl);
+    });
 
-    SurfaceComposerClient::openGlobalTransaction();
-    half3 color(43.0f/255.0f, 207.0f/255.0f, 131.0f/255.0f);
-    mLayerColorControl->setColor(color);
-    mLayerColorControl->show();
-    SurfaceComposerClient::closeGlobalTransaction(true);
     {
         // There should now be a color
         SCOPED_TRACE("after setColor");
+
         ScreenCapture::captureScreen(&sc);
         sc->checkPixel(145, 145, 43, 207, 131);
     }
@@ -1372,12 +1396,13 @@
         sc->expectBGColor(145, 145);
     }
 
-    SurfaceComposerClient::openGlobalTransaction();
-    half3 color(43.0f/255.0f, 207.0f/255.0f, 131.0f/255.0f);
-    mLayerColorControl->setColor(color);
-    mLayerColorControl->setAlpha(.75f);
-    mLayerColorControl->show();
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        half3 color(43.0f/255.0f, 207.0f/255.0f, 131.0f/255.0f);
+        t.setColor(mLayerColorControl, color);
+        t.setAlpha(mLayerColorControl, .75f);
+        t.show(mLayerColorControl);
+    });
+
     {
         // There should now be a color with .75 alpha
         SCOPED_TRACE("after setColor");
@@ -1394,9 +1419,10 @@
         sc->expectBGColor(145, 145);
     }
 
-    SurfaceComposerClient::openGlobalTransaction();
-    mLayerColorControl->show();
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    asTransaction([&](Transaction& t) {
+        t.show(mLayerColorControl);
+    });
+
     {
         // There should now be set to 0,0,0 (black) as default.
         SCOPED_TRACE("after setColor");
diff --git a/services/surfaceflinger/tests/fakehwc/FakeComposerUtils.h b/services/surfaceflinger/tests/fakehwc/FakeComposerUtils.h
index 74dc0e5..1258a97 100644
--- a/services/surfaceflinger/tests/fakehwc/FakeComposerUtils.h
+++ b/services/surfaceflinger/tests/fakehwc/FakeComposerUtils.h
@@ -87,7 +87,7 @@
 
 /*
  * All surface state changes are supposed to happen inside a global
- * transaction. GlobalTransactionScope object at the beginning of
+ * transaction. TransactionScope object at the beginning of
  * scope automates the process. The resulting scope gives a visual cue
  * on the span of the transaction as well.
  *
@@ -96,23 +96,26 @@
  * is built to explicitly request vsyncs one at the time. A delayed
  * request must be made before closing the transaction or the test
  * thread stalls until SurfaceFlinger does an emergency vsync by
- * itself. GlobalTransactionScope encapsulates this vsync magic.
+ * itself. TransactionScope encapsulates this vsync magic.
  */
-class GlobalTransactionScope {
+class TransactionScope : public android::SurfaceComposerClient::Transaction {
 public:
-    GlobalTransactionScope(FakeComposerClient& composer) : mComposer(composer) {
-        android::SurfaceComposerClient::openGlobalTransaction();
+    TransactionScope(FakeComposerClient& composer) :
+            Transaction(),
+            mComposer(composer) {
     }
-    ~GlobalTransactionScope() {
+
+    ~TransactionScope() {
         int frameCount = mComposer.getFrameCount();
         mComposer.runVSyncAfter(1ms);
-        android::SurfaceComposerClient::closeGlobalTransaction(true);
+        LOG_ALWAYS_FATAL_IF(android::NO_ERROR != apply());
         // Make sure that exactly one frame has been rendered.
         mComposer.waitUntilFrame(frameCount + 1);
         LOG_ALWAYS_FATAL_IF(frameCount + 1 != mComposer.getFrameCount(),
                             "Unexpected frame advance. Delta: %d",
                             mComposer.getFrameCount() - frameCount);
     }
+
     FakeComposerClient& mComposer;
 };
 
diff --git a/services/surfaceflinger/tests/fakehwc/SFFakeHwc_test.cpp b/services/surfaceflinger/tests/fakehwc/SFFakeHwc_test.cpp
index 9ac3331..7f4c58a 100644
--- a/services/surfaceflinger/tests/fakehwc/SFFakeHwc_test.cpp
+++ b/services/surfaceflinger/tests/fakehwc/SFFakeHwc_test.cpp
@@ -24,11 +24,11 @@
 
 #include <gui/ISurfaceComposer.h>
 #include <gui/LayerDebugInfo.h>
+#include <gui/LayerState.h>
 #include <gui/Surface.h>
 #include <gui/SurfaceComposerClient.h>
 
 #include <private/gui/ComposerService.h>
-#include <private/gui/LayerState.h>
 
 #include <ui/DisplayInfo.h>
 
@@ -62,6 +62,8 @@
 using ::testing::SetArgPointee;
 using ::testing::_;
 
+using Transaction = SurfaceComposerClient::Transaction;
+
 ///////////////////////////////////////////////
 
 struct TestColor {
@@ -248,11 +250,11 @@
         fillSurfaceRGBA8(surfaceControl, BLUE);
 
         {
-            GlobalTransactionScope gts(*mMockComposer);
-            mComposerClient->setDisplayLayerStack(display, 0);
+            TransactionScope ts(*mMockComposer);
+            ts.setDisplayLayerStack(display, 0);
 
-            ASSERT_EQ(NO_ERROR, surfaceControl->setLayer(INT32_MAX - 2));
-            ASSERT_EQ(NO_ERROR, surfaceControl->show());
+            ts.setLayer(surfaceControl, INT32_MAX - 2)
+                .show(surfaceControl);
         }
     }
 
@@ -278,11 +280,11 @@
         fillSurfaceRGBA8(surfaceControl, BLUE);
 
         {
-            GlobalTransactionScope gts(*mMockComposer);
-            mComposerClient->setDisplayLayerStack(display, 0);
+            TransactionScope ts(*mMockComposer);
+            ts.setDisplayLayerStack(display, 0);
 
-            ASSERT_EQ(NO_ERROR, surfaceControl->setLayer(INT32_MAX - 2));
-            ASSERT_EQ(NO_ERROR, surfaceControl->show());
+            ts.setLayer(surfaceControl, INT32_MAX - 2)
+                .show(surfaceControl);
         }
     }
     mMockComposer->hotplugDisplay(EXTERNAL_DISPLAY, IComposerCallback::Connection::DISCONNECTED);
@@ -370,25 +372,24 @@
 
     fillSurfaceRGBA8(mFGSurfaceControl, RED);
 
-    SurfaceComposerClient::openGlobalTransaction();
+    Transaction t;
+    t.setDisplayLayerStack(display, 0);
 
-    mComposerClient->setDisplayLayerStack(display, 0);
+    t.setLayer(mBGSurfaceControl, INT32_MAX - 2);
+    t.show(mBGSurfaceControl);
 
-    ASSERT_EQ(NO_ERROR, mBGSurfaceControl->setLayer(INT32_MAX - 2));
-    ASSERT_EQ(NO_ERROR, mBGSurfaceControl->show());
-
-    ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setLayer(INT32_MAX - 1));
-    ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setPosition(64, 64));
-    ASSERT_EQ(NO_ERROR, mFGSurfaceControl->show());
+    t.setLayer(mFGSurfaceControl, INT32_MAX - 1);
+    t.setPosition(mFGSurfaceControl, 64, 64);
+    t.show(mFGSurfaceControl);
 
     // Synchronous transaction will stop this thread, so we set up a
     // delayed, off-thread vsync request before closing the
     // transaction. In the test code this is usually done with
-    // GlobalTransactionScope. Leaving here in the 'vanilla' form for
+    // TransactionScope. Leaving here in the 'vanilla' form for
     // reference.
     ASSERT_EQ(0, sFakeComposer->getFrameCount());
     sFakeComposer->runVSyncAfter(1ms);
-    SurfaceComposerClient::closeGlobalTransaction(true);
+    t.apply();
     sFakeComposer->waitUntilFrame(1);
 
     // Reference data. This is what the HWC should see.
@@ -445,8 +446,8 @@
     // should be available in the latest frame stored by the fake
     // composer.
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setPosition(128, 128));
+        TransactionScope ts(*sFakeComposer);
+        ts.setPosition(mFGSurfaceControl, 128, 128);
         // NOTE: No changes yet, so vsync will do nothing, HWC does not get any calls.
         // (How to verify that? Throw in vsync and wait a 2x frame time? Separate test?)
         //
@@ -473,8 +474,8 @@
 TEST_F(TransactionTest, LayerResize) {
     ALOGD("TransactionTest::LayerResize");
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setSize(128, 128));
+        TransactionScope ts(*sFakeComposer);
+        ts.setSize(mFGSurfaceControl, 128, 128);
     }
 
     fillSurfaceRGBA8(mFGSurfaceControl, GREEN);
@@ -497,9 +498,9 @@
 TEST_F(TransactionTest, LayerCrop) {
     // TODO: Add scaling to confirm that crop happens in buffer space?
     {
-        GlobalTransactionScope gts(*sFakeComposer);
+        TransactionScope ts(*sFakeComposer);
         Rect cropRect(16, 16, 32, 32);
-        ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setCrop(cropRect));
+        ts.setCrop(mFGSurfaceControl, cropRect);
     }
     ASSERT_EQ(2, sFakeComposer->getFrameCount());
 
@@ -512,9 +513,9 @@
 TEST_F(TransactionTest, LayerFinalCrop) {
     // TODO: Add scaling to confirm that crop happens in display space?
     {
-        GlobalTransactionScope gts(*sFakeComposer);
+        TransactionScope ts(*sFakeComposer);
         Rect cropRect(32, 32, 32 + 64, 32 + 64);
-        ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setFinalCrop(cropRect));
+        ts.setFinalCrop(mFGSurfaceControl, cropRect);
     }
     ASSERT_EQ(2, sFakeComposer->getFrameCount());
 
@@ -530,9 +531,9 @@
 TEST_F(TransactionTest, LayerFinalCropEmpty) {
     // TODO: Add scaling to confirm that crop happens in display space?
     {
-        GlobalTransactionScope gts(*sFakeComposer);
+        TransactionScope ts(*sFakeComposer);
         Rect cropRect(16, 16, 32, 32);
-        ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setFinalCrop(cropRect));
+        ts.setFinalCrop(mFGSurfaceControl, cropRect);
     }
     ASSERT_EQ(2, sFakeComposer->getFrameCount());
 
@@ -545,8 +546,8 @@
 
 TEST_F(TransactionTest, LayerSetLayer) {
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setLayer(INT_MAX - 3));
+        TransactionScope ts(*sFakeComposer);
+        ts.setLayer(mFGSurfaceControl, INT_MAX - 3);
     }
     ASSERT_EQ(2, sFakeComposer->getFrameCount());
 
@@ -560,11 +561,10 @@
 
 TEST_F(TransactionTest, LayerSetLayerOpaque) {
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setLayer(INT_MAX - 3));
-        ASSERT_EQ(NO_ERROR,
-                  mBGSurfaceControl->setFlags(layer_state_t::eLayerOpaque,
-                                              layer_state_t::eLayerOpaque));
+        TransactionScope ts(*sFakeComposer);
+        ts.setLayer(mFGSurfaceControl, INT_MAX - 3);
+        ts.setFlags(mBGSurfaceControl, layer_state_t::eLayerOpaque,
+                layer_state_t::eLayerOpaque);
     }
     ASSERT_EQ(2, sFakeComposer->getFrameCount());
 
@@ -577,8 +577,8 @@
 TEST_F(TransactionTest, SetLayerStack) {
     ALOGD("TransactionTest::SetLayerStack");
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setLayerStack(1));
+        TransactionScope ts(*sFakeComposer);
+        ts.setLayerStack(mFGSurfaceControl, 1);
     }
 
     // Foreground layer should have disappeared.
@@ -591,8 +591,8 @@
 TEST_F(TransactionTest, LayerShowHide) {
     ALOGD("TransactionTest::LayerShowHide");
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        ASSERT_EQ(NO_ERROR, mFGSurfaceControl->hide());
+        TransactionScope ts(*sFakeComposer);
+        ts.hide(mFGSurfaceControl);
     }
 
     // Foreground layer should have disappeared.
@@ -602,8 +602,8 @@
     EXPECT_TRUE(framesAreSame(refFrame, sFakeComposer->getLatestFrame()));
 
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        ASSERT_EQ(NO_ERROR, mFGSurfaceControl->show());
+        TransactionScope ts(*sFakeComposer);
+        ts.show(mFGSurfaceControl);
     }
 
     // Foreground layer should be back
@@ -613,8 +613,8 @@
 
 TEST_F(TransactionTest, LayerSetAlpha) {
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setAlpha(0.75f));
+        TransactionScope ts(*sFakeComposer);
+        ts.setAlpha(mFGSurfaceControl, 0.75f);
     }
 
     ASSERT_EQ(2, sFakeComposer->getFrameCount());
@@ -625,10 +625,9 @@
 
 TEST_F(TransactionTest, LayerSetFlags) {
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        ASSERT_EQ(NO_ERROR,
-                  mFGSurfaceControl->setFlags(layer_state_t::eLayerHidden,
-                                              layer_state_t::eLayerHidden));
+        TransactionScope ts(*sFakeComposer);
+        ts.setFlags(mFGSurfaceControl, layer_state_t::eLayerHidden,
+                layer_state_t::eLayerHidden);
     }
 
     // Foreground layer should have disappeared.
@@ -667,10 +666,9 @@
         const matrixTestData& xform = MATRIX_TESTS[i];
         SCOPED_TRACE(i);
         {
-            GlobalTransactionScope gts(*sFakeComposer);
-            ASSERT_EQ(NO_ERROR,
-                      mFGSurfaceControl->setMatrix(xform.matrix[0], xform.matrix[1],
-                                                   xform.matrix[2], xform.matrix[3]));
+            TransactionScope ts(*sFakeComposer);
+            ts.setMatrix(mFGSurfaceControl, xform.matrix[0], xform.matrix[1],
+                    xform.matrix[2], xform.matrix[3]);
         }
 
         auto referenceFrame = mBaseFrame;
@@ -684,10 +682,10 @@
 #if 0
 TEST_F(TransactionTest, LayerSetMatrix2) {
     {
-        GlobalTransactionScope gts(*sFakeComposer);
+        TransactionScope ts(*sFakeComposer);
         // TODO: PLEASE SPEC THE FUNCTION!
-        ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setMatrix(0.11f, 0.123f,
-                                                         -2.33f, 0.22f));
+        ts.setMatrix(mFGSurfaceControl, 0.11f, 0.123f,
+                -2.33f, 0.22f);
     }
     auto referenceFrame = mBaseFrame;
     // TODO: Is this correct for sure?
@@ -708,10 +706,10 @@
     fillSurfaceRGBA8(syncSurfaceControl, DARK_GRAY);
 
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        ASSERT_EQ(NO_ERROR, syncSurfaceControl->setLayer(INT32_MAX - 1));
-        ASSERT_EQ(NO_ERROR, syncSurfaceControl->setPosition(mDisplayWidth - 2, mDisplayHeight - 2));
-        ASSERT_EQ(NO_ERROR, syncSurfaceControl->show());
+        TransactionScope ts(*sFakeComposer);
+        ts.setLayer(syncSurfaceControl, INT32_MAX - 1);
+        ts.setPosition(syncSurfaceControl, mDisplayWidth - 2, mDisplayHeight - 2);
+        ts.show(syncSurfaceControl);
     }
     auto referenceFrame = mBaseFrame;
     referenceFrame.push_back(makeSimpleRect(mDisplayWidth - 2, mDisplayHeight - 2,
@@ -723,20 +721,20 @@
     // set up two deferred transactions on different frames - these should not yield composited
     // frames
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setAlpha(0.75));
-        mFGSurfaceControl
-                ->deferTransactionUntil(syncSurfaceControl->getHandle(),
-                                        syncSurfaceControl->getSurface()->getNextFrameNumber());
+        TransactionScope ts(*sFakeComposer);
+        ts.setAlpha(mFGSurfaceControl, 0.75);
+        ts.deferTransactionUntil(mFGSurfaceControl, 
+                syncSurfaceControl->getHandle(),
+                syncSurfaceControl->getSurface()->getNextFrameNumber());
     }
     EXPECT_TRUE(framesAreSame(referenceFrame, sFakeComposer->getLatestFrame()));
 
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setPosition(128, 128));
-        mFGSurfaceControl
-                ->deferTransactionUntil(syncSurfaceControl->getHandle(),
-                                        syncSurfaceControl->getSurface()->getNextFrameNumber() + 1);
+        TransactionScope ts(*sFakeComposer);
+        ts.setPosition(mFGSurfaceControl, 128, 128);
+        ts.deferTransactionUntil(mFGSurfaceControl,
+                syncSurfaceControl->getHandle(),
+                syncSurfaceControl->getSurface()->getNextFrameNumber() + 1);
     }
     EXPECT_EQ(4, sFakeComposer->getFrameCount());
     EXPECT_TRUE(framesAreSame(referenceFrame, sFakeComposer->getLatestFrame()));
@@ -752,8 +750,8 @@
 
     // should show up immediately since it's not deferred
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setAlpha(1.0));
+        TransactionScope ts(*sFakeComposer);
+        ts.setAlpha(mFGSurfaceControl, 1.0);
     }
     referenceFrame[FG_LAYER].mPlaneAlpha = 1.f;
     EXPECT_EQ(6, sFakeComposer->getFrameCount());
@@ -777,10 +775,10 @@
 
     // Now we stack the surface above the foreground surface and make sure it is visible.
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        relativeSurfaceControl->setPosition(64, 64);
-        relativeSurfaceControl->show();
-        relativeSurfaceControl->setRelativeLayer(mFGSurfaceControl->getHandle(), 1);
+        TransactionScope ts(*sFakeComposer);
+        ts.setPosition(relativeSurfaceControl, 64, 64);
+        ts.show(relativeSurfaceControl);
+        ts.setRelativeLayer(relativeSurfaceControl, mFGSurfaceControl->getHandle(), 1);
     }
     auto referenceFrame = mBaseFrame;
     // NOTE: All three layers will be visible as the surfaces are
@@ -791,8 +789,8 @@
 
     // A call to setLayer will override a call to setRelativeLayer
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        relativeSurfaceControl->setLayer(0);
+        TransactionScope ts(*sFakeComposer);
+        ts.setLayer(relativeSurfaceControl, 0);
     }
 
     // Previous top layer will now appear at the bottom.
@@ -828,11 +826,11 @@
 
 TEST_F(ChildLayerTest, Positioning) {
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mChild->show();
-        mChild->setPosition(10, 10);
+        TransactionScope ts(*sFakeComposer);
+        ts.show(mChild);
+        ts.setPosition(mChild, 10, 10);
         // Move to the same position as in the original setup.
-        mFGSurfaceControl->setPosition(64, 64);
+        ts.setPosition(mFGSurfaceControl, 64, 64);
     }
 
     auto referenceFrame = mBaseFrame;
@@ -842,8 +840,8 @@
     EXPECT_TRUE(framesAreSame(referenceFrame, sFakeComposer->getLatestFrame()));
 
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setPosition(0, 0));
+        TransactionScope ts(*sFakeComposer);
+        ts.setPosition(mFGSurfaceControl, 0, 0);
     }
 
     auto referenceFrame2 = mBaseFrame;
@@ -855,11 +853,11 @@
 
 TEST_F(ChildLayerTest, Cropping) {
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mChild->show();
-        mChild->setPosition(0, 0);
-        mFGSurfaceControl->setPosition(0, 0);
-        mFGSurfaceControl->setCrop(Rect(0, 0, 5, 5));
+        TransactionScope ts(*sFakeComposer);
+        ts.show(mChild);
+        ts.setPosition(mChild, 0, 0);
+        ts.setPosition(mFGSurfaceControl, 0, 0);
+        ts.setCrop(mFGSurfaceControl, Rect(0, 0, 5, 5));
     }
     // NOTE: The foreground surface would be occluded by the child
     // now, but is included in the stack because the child is
@@ -874,11 +872,11 @@
 
 TEST_F(ChildLayerTest, FinalCropping) {
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mChild->show();
-        mChild->setPosition(0, 0);
-        mFGSurfaceControl->setPosition(0, 0);
-        mFGSurfaceControl->setFinalCrop(Rect(0, 0, 5, 5));
+        TransactionScope ts(*sFakeComposer);
+        ts.show(mChild);
+        ts.setPosition(mChild, 0, 0);
+        ts.setPosition(mFGSurfaceControl, 0, 0);
+        ts.setFinalCrop(mFGSurfaceControl, Rect(0, 0, 5, 5));
     }
     auto referenceFrame = mBaseFrame;
     referenceFrame[FG_LAYER].mDisplayFrame = hwc_rect_t{0, 0, 0 + 5, 0 + 5};
@@ -890,10 +888,10 @@
 
 TEST_F(ChildLayerTest, Constraints) {
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mChild->show();
-        mFGSurfaceControl->setPosition(0, 0);
-        mChild->setPosition(63, 63);
+        TransactionScope ts(*sFakeComposer);
+        ts.show(mChild);
+        ts.setPosition(mFGSurfaceControl, 0, 0);
+        ts.setPosition(mChild, 63, 63);
     }
     auto referenceFrame = mBaseFrame;
     referenceFrame[FG_LAYER].mDisplayFrame = hwc_rect_t{0, 0, 64, 64};
@@ -904,8 +902,8 @@
 
 TEST_F(ChildLayerTest, Scaling) {
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mFGSurfaceControl->setPosition(0, 0);
+        TransactionScope ts(*sFakeComposer);
+        ts.setPosition(mFGSurfaceControl, 0, 0);
     }
     auto referenceFrame = mBaseFrame;
     referenceFrame[FG_LAYER].mDisplayFrame = hwc_rect_t{0, 0, 64, 64};
@@ -913,8 +911,8 @@
     EXPECT_TRUE(framesAreSame(referenceFrame, sFakeComposer->getLatestFrame()));
 
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mFGSurfaceControl->setMatrix(2.0, 0, 0, 2.0);
+        TransactionScope ts(*sFakeComposer);
+        ts.setMatrix(mFGSurfaceControl, 2.0, 0, 0, 2.0);
     }
 
     auto referenceFrame2 = mBaseFrame;
@@ -925,11 +923,11 @@
 
 TEST_F(ChildLayerTest, LayerAlpha) {
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mChild->show();
-        mChild->setPosition(0, 0);
-        mFGSurfaceControl->setPosition(0, 0);
-        ASSERT_EQ(NO_ERROR, mChild->setAlpha(0.5));
+        TransactionScope ts(*sFakeComposer);
+        ts.show(mChild);
+        ts.setPosition(mChild, 0, 0);
+        ts.setPosition(mFGSurfaceControl, 0, 0);
+        ts.setAlpha(mChild, 0.5);
     }
 
     auto referenceFrame = mBaseFrame;
@@ -939,8 +937,8 @@
     EXPECT_TRUE(framesAreSame(referenceFrame, sFakeComposer->getLatestFrame()));
 
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        ASSERT_EQ(NO_ERROR, mFGSurfaceControl->setAlpha(0.5));
+        TransactionScope ts(*sFakeComposer);
+        ts.setAlpha(mFGSurfaceControl, 0.5);
     }
 
     auto referenceFrame2 = referenceFrame;
@@ -951,10 +949,10 @@
 
 TEST_F(ChildLayerTest, ReparentChildren) {
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mChild->show();
-        mChild->setPosition(10, 10);
-        mFGSurfaceControl->setPosition(64, 64);
+        TransactionScope ts(*sFakeComposer);
+        ts.show(mChild);
+        ts.setPosition(mChild, 10, 10);
+        ts.setPosition(mFGSurfaceControl, 64, 64);
     }
     auto referenceFrame = mBaseFrame;
     referenceFrame[FG_LAYER].mDisplayFrame = hwc_rect_t{64, 64, 64 + 64, 64 + 64};
@@ -963,8 +961,8 @@
     EXPECT_TRUE(framesAreSame(referenceFrame, sFakeComposer->getLatestFrame()));
 
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mFGSurfaceControl->reparentChildren(mBGSurfaceControl->getHandle());
+        TransactionScope ts(*sFakeComposer);
+        ts.reparentChildren(mFGSurfaceControl, mBGSurfaceControl->getHandle());
     }
 
     auto referenceFrame2 = referenceFrame;
@@ -975,10 +973,10 @@
 
 TEST_F(ChildLayerTest, DetachChildren) {
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mChild->show();
-        mChild->setPosition(10, 10);
-        mFGSurfaceControl->setPosition(64, 64);
+        TransactionScope ts(*sFakeComposer);
+        ts.show(mChild);
+        ts.setPosition(mChild, 10, 10);
+        ts.setPosition(mFGSurfaceControl, 64, 64);
     }
 
     auto referenceFrame = mBaseFrame;
@@ -988,13 +986,13 @@
     EXPECT_TRUE(framesAreSame(referenceFrame, sFakeComposer->getLatestFrame()));
 
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mFGSurfaceControl->detachChildren();
+        TransactionScope ts(*sFakeComposer);
+        ts.detachChildren(mFGSurfaceControl);
     }
 
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mChild->hide();
+        TransactionScope ts(*sFakeComposer);
+        ts.hide(mChild);
     }
 
     // Nothing should have changed. The child control becomes a no-op
@@ -1005,17 +1003,17 @@
 
 TEST_F(ChildLayerTest, InheritNonTransformScalingFromParent) {
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mChild->show();
-        mChild->setPosition(0, 0);
-        mFGSurfaceControl->setPosition(0, 0);
+        TransactionScope ts(*sFakeComposer);
+        ts.show(mChild);
+        ts.setPosition(mChild, 0, 0);
+        ts.setPosition(mFGSurfaceControl, 0, 0);
     }
 
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mFGSurfaceControl->setOverrideScalingMode(NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW);
+        TransactionScope ts(*sFakeComposer);
+        ts.setOverrideScalingMode(mFGSurfaceControl, NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW);
         // We cause scaling by 2.
-        mFGSurfaceControl->setSize(128, 128);
+        ts.setSize(mFGSurfaceControl, 128, 128);
     }
 
     auto referenceFrame = mBaseFrame;
@@ -1029,17 +1027,17 @@
 // Regression test for b/37673612
 TEST_F(ChildLayerTest, ChildrenWithParentBufferTransform) {
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mChild->show();
-        mChild->setPosition(0, 0);
-        mFGSurfaceControl->setPosition(0, 0);
+        TransactionScope ts(*sFakeComposer);
+        ts.show(mChild);
+        ts.setPosition(mChild, 0, 0);
+        ts.setPosition(mFGSurfaceControl, 0, 0);
     }
 
     // We set things up as in b/37673612 so that there is a mismatch between the buffer size and
     // the WM specified state size.
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mFGSurfaceControl->setSize(128, 64);
+        TransactionScope ts(*sFakeComposer);
+        ts.setSize(mFGSurfaceControl, 128, 64);
     }
 
     sp<Surface> s = mFGSurfaceControl->getSurface();
@@ -1070,10 +1068,10 @@
 
     // Show the child layer in a deferred transaction
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mChild->deferTransactionUntil(mFGSurfaceControl->getHandle(),
+        TransactionScope ts(*sFakeComposer);
+        ts.deferTransactionUntil(mChild, mFGSurfaceControl->getHandle(), 
                                       mFGSurfaceControl->getSurface()->getNextFrameNumber());
-        mChild->show();
+        ts.show(mChild);
     }
 
     // Render the foreground surface a few times
@@ -1110,11 +1108,11 @@
         sFakeComposer->runVSyncAndWait();
     }
     void restoreInitialState() {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mFGSurfaceControl->setSize(64, 64);
-        mFGSurfaceControl->setPosition(64, 64);
-        mFGSurfaceControl->setCrop(Rect(0, 0, 64, 64));
-        mFGSurfaceControl->setFinalCrop(Rect(0, 0, -1, -1));
+        TransactionScope ts(*sFakeComposer);
+        ts.setSize(mFGSurfaceControl, 64, 64);
+        ts.setPosition(mFGSurfaceControl, 64, 64);
+        ts.setCrop(mFGSurfaceControl, Rect(0, 0, 64, 64));
+        ts.setFinalCrop(mFGSurfaceControl, Rect(0, 0, -1, -1));
     }
 };
 
@@ -1122,9 +1120,9 @@
     // By default position can be updated even while
     // a resize is pending.
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mFGSurfaceControl->setSize(32, 32);
-        mFGSurfaceControl->setPosition(100, 100);
+        TransactionScope ts(*sFakeComposer);
+        ts.setSize(mFGSurfaceControl, 32, 32);
+        ts.setPosition(mFGSurfaceControl, 100, 100);
     }
 
     // The size should not have updated as we have not provided a new buffer.
@@ -1137,10 +1135,10 @@
     // Now we repeat with setGeometryAppliesWithResize
     // and verify the position DOESN'T latch.
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mFGSurfaceControl->setGeometryAppliesWithResize();
-        mFGSurfaceControl->setSize(32, 32);
-        mFGSurfaceControl->setPosition(100, 100);
+        TransactionScope ts(*sFakeComposer);
+        ts.setGeometryAppliesWithResize(mFGSurfaceControl);
+        ts.setSize(mFGSurfaceControl, 32, 32);
+        ts.setPosition(mFGSurfaceControl, 100, 100);
     }
     EXPECT_TRUE(framesAreSame(mBaseFrame, sFakeComposer->getLatestFrame()));
 
@@ -1156,9 +1154,9 @@
 TEST_F(LatchingTest, CropLatching) {
     // Normally the crop applies immediately even while a resize is pending.
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mFGSurfaceControl->setSize(128, 128);
-        mFGSurfaceControl->setCrop(Rect(0, 0, 63, 63));
+        TransactionScope ts(*sFakeComposer);
+        ts.setSize(mFGSurfaceControl, 128, 128);
+        ts.setCrop(mFGSurfaceControl, Rect(0, 0, 63, 63));
     }
 
     auto referenceFrame1 = mBaseFrame;
@@ -1169,10 +1167,10 @@
     restoreInitialState();
 
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mFGSurfaceControl->setSize(128, 128);
-        mFGSurfaceControl->setGeometryAppliesWithResize();
-        mFGSurfaceControl->setCrop(Rect(0, 0, 63, 63));
+        TransactionScope ts(*sFakeComposer);
+        ts.setSize(mFGSurfaceControl, 128, 128);
+        ts.setGeometryAppliesWithResize(mFGSurfaceControl);
+        ts.setCrop(mFGSurfaceControl, Rect(0, 0, 63, 63));
     }
     EXPECT_TRUE(framesAreSame(mBaseFrame, sFakeComposer->getLatestFrame()));
 
@@ -1188,9 +1186,9 @@
 TEST_F(LatchingTest, FinalCropLatching) {
     // Normally the crop applies immediately even while a resize is pending.
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mFGSurfaceControl->setSize(128, 128);
-        mFGSurfaceControl->setFinalCrop(Rect(64, 64, 127, 127));
+        TransactionScope ts(*sFakeComposer);
+        ts.setSize(mFGSurfaceControl, 128, 128);
+        ts.setFinalCrop(mFGSurfaceControl, Rect(64, 64, 127, 127));
     }
 
     auto referenceFrame1 = mBaseFrame;
@@ -1202,10 +1200,10 @@
     restoreInitialState();
 
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mFGSurfaceControl->setSize(128, 128);
-        mFGSurfaceControl->setGeometryAppliesWithResize();
-        mFGSurfaceControl->setFinalCrop(Rect(64, 64, 127, 127));
+        TransactionScope ts(*sFakeComposer);
+        ts.setSize(mFGSurfaceControl, 128, 128);
+        ts.setGeometryAppliesWithResize(mFGSurfaceControl);
+        ts.setFinalCrop(mFGSurfaceControl, Rect(64, 64, 127, 127));
     }
     EXPECT_TRUE(framesAreSame(mBaseFrame, sFakeComposer->getLatestFrame()));
 
@@ -1224,9 +1222,9 @@
 TEST_F(LatchingTest, FinalCropLatchingBufferOldSize) {
     // Normally the crop applies immediately even while a resize is pending.
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mFGSurfaceControl->setSize(128, 128);
-        mFGSurfaceControl->setFinalCrop(Rect(64, 64, 127, 127));
+        TransactionScope ts(*sFakeComposer);
+        ts.setSize(mFGSurfaceControl, 128, 128);
+        ts.setFinalCrop(mFGSurfaceControl, Rect(64, 64, 127, 127));
     }
 
     auto referenceFrame1 = mBaseFrame;
@@ -1242,10 +1240,10 @@
     lockAndFillFGBuffer();
 
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mFGSurfaceControl->setSize(128, 128);
-        mFGSurfaceControl->setGeometryAppliesWithResize();
-        mFGSurfaceControl->setFinalCrop(Rect(64, 64, 127, 127));
+        TransactionScope ts(*sFakeComposer);
+        ts.setSize(mFGSurfaceControl, 128, 128);
+        ts.setGeometryAppliesWithResize(mFGSurfaceControl);
+        ts.setFinalCrop(mFGSurfaceControl, Rect(64, 64, 127, 127));
     }
     EXPECT_TRUE(framesAreSame(mBaseFrame, sFakeComposer->getLatestFrame()));
 
@@ -1271,15 +1269,15 @@
     // is still pending, and ensure we are successful. Success meaning the second crop
     // is the one which eventually latches and not the first.
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mFGSurfaceControl->setSize(128, 128);
-        mFGSurfaceControl->setGeometryAppliesWithResize();
-        mFGSurfaceControl->setFinalCrop(Rect(64, 64, 127, 127));
+        TransactionScope ts(*sFakeComposer);
+        ts.setSize(mFGSurfaceControl, 128, 128);
+        ts.setGeometryAppliesWithResize(mFGSurfaceControl);
+        ts.setFinalCrop(mFGSurfaceControl, Rect(64, 64, 127, 127));
     }
 
     {
-        GlobalTransactionScope gts(*sFakeComposer);
-        mFGSurfaceControl->setFinalCrop(Rect(0, 0, -1, -1));
+        TransactionScope ts(*sFakeComposer);
+        ts.setFinalCrop(mFGSurfaceControl, Rect(0, 0, -1, -1));
     }
     EXPECT_TRUE(framesAreSame(mBaseFrame, sFakeComposer->getLatestFrame()));