Front buffered layers vote for max

...because all known use-cases for beam racing want low latency which
implies clocking the display to max

Bug: 305997105
Test: libsurfaceflinger_unittest
Test: test app with front buffered layers + youtube pip stays at max
Change-Id: Ibe33d4b43ea4943874f104409e3bc247f00cae33
diff --git a/services/surfaceflinger/tests/unittests/LayerInfoTest.cpp b/services/surfaceflinger/tests/unittests/LayerInfoTest.cpp
index 11072bc..5a03c59 100644
--- a/services/surfaceflinger/tests/unittests/LayerInfoTest.cpp
+++ b/services/surfaceflinger/tests/unittests/LayerInfoTest.cpp
@@ -21,6 +21,7 @@
 
 #include <scheduler/Fps.h>
 
+#include "FlagUtils.h"
 #include "FpsOps.h"
 #include "Scheduler/LayerHistory.h"
 #include "Scheduler/LayerInfo.h"
@@ -28,6 +29,8 @@
 #include "TestableSurfaceFlinger.h"
 #include "mock/MockSchedulerCallback.h"
 
+#include <com_android_graphics_surfaceflinger_flags.h>
+
 namespace android::scheduler {
 
 using android::mock::createDisplayMode;
@@ -67,6 +70,8 @@
 
 namespace {
 
+using namespace com::android::graphics::surfaceflinger;
+
 TEST_F(LayerInfoTest, prefersPresentTime) {
     std::deque<FrameTimeData> frameTimes;
     constexpr auto kExpectedFps = 50_Hz;
@@ -261,5 +266,18 @@
     ASSERT_EQ(actualVotes[0].fps, vote.fps);
 }
 
+TEST_F(LayerInfoTest, isFrontBuffered) {
+    SET_FLAG_FOR_TEST(flags::vrr_config, true);
+    ASSERT_FALSE(layerInfo.isFrontBuffered());
+
+    LayerProps prop = {.isFrontBuffered = true};
+    layerInfo.setLastPresentTime(0, 0, LayerHistory::LayerUpdateType::Buffer, true, prop);
+    ASSERT_TRUE(layerInfo.isFrontBuffered());
+
+    prop.isFrontBuffered = false;
+    layerInfo.setLastPresentTime(0, 0, LayerHistory::LayerUpdateType::Buffer, true, prop);
+    ASSERT_FALSE(layerInfo.isFrontBuffered());
+}
+
 } // namespace
 } // namespace android::scheduler