diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index 477ace5..01f1ac3 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -33,6 +33,7 @@
 #include <utils/RefBase.h>
 #include <utils/SortedVector.h>
 #include <utils/threads.h>
+#include <utils/Trace.h>
 
 #include <ui/FenceTime.h>
 #include <ui/PixelFormat.h>
@@ -55,6 +56,7 @@
 #include "Barrier.h"
 #include "DisplayDevice.h"
 #include "DispSync.h"
+#include "EventThread.h"
 #include "FrameTracker.h"
 #include "LayerStats.h"
 #include "LayerVector.h"
@@ -63,6 +65,7 @@
 #include "SurfaceTracing.h"
 #include "StartPropertySetThread.h"
 #include "LayerBE.h"
+#include "VSyncModulator.h"
 
 #include "DisplayHardware/HWC2.h"
 #include "DisplayHardware/HWComposer.h"
@@ -494,6 +497,7 @@
     uint32_t peekTransactionFlags();
     // Can only be called from the main thread or with mStateLock held
     uint32_t setTransactionFlags(uint32_t flags);
+    uint32_t setTransactionFlags(uint32_t flags, VSyncModulator::TransactionStart transactionStart);
     void commitTransaction();
     bool containsAnyInvalidClientState(const Vector<ComposerState>& states);
     uint32_t setClientStateLocked(const ComposerState& composerState);
@@ -767,6 +771,8 @@
     std::unique_ptr<EventControlThread> mEventControlThread;
     sp<IBinder> mBuiltinDisplays[DisplayDevice::NUM_BUILTIN_DISPLAY_TYPES];
 
+    VSyncModulator mVsyncModulator;
+
     // Can only accessed from the main thread, these members
     // don't need synchronization
     State mDrawingState{LayerVector::StateSet::Drawing};