cc: Measure compositor timing with finer granularity

components/view_manager/surfaces/surfaces_scheduler.cc

Index: components/view_manager/surfaces/surfaces_scheduler.cc
diff --git a/components/view_manager/surfaces/surfaces_scheduler.cc b/components/view_manager/surfaces/surfaces_scheduler.cc
index 2757642d10dee43afeb9c4d92c3c7f83eccbfd87..7cf6cebc861068ee715bba9afc5ddd08aa946ef4 100644
--- a/components/view_manager/surfaces/surfaces_scheduler.cc
+++ b/components/view_manager/surfaces/surfaces_scheduler.cc
@@ -8,10 +8,13 @@
 
 namespace surfaces {
 
-SurfacesScheduler::SurfacesScheduler() {
+SurfacesScheduler::SurfacesScheduler()
+    : rendering_stats_instrumentation_(
+          RenderingStatsInstrumentation::Create()) {
   cc::SchedulerSettings settings;
   scheduler_ = cc::Scheduler::Create(
-      this, settings, 0, base::MessageLoop::current()->task_runner(), nullptr);
+      this, settings, 0, base::MessageLoop::current()->task_runner(), nullptr,
+      rendering_stats_instrumentation_.get());
   scheduler_->SetCanStart();
   scheduler_->SetVisible(true);
   scheduler_->SetCanDraw(true);
@@ -61,13 +64,9 @@ void SurfacesScheduler::ScheduledActionSendBeginMainFrame() {
 }
 
 cc::DrawResult SurfacesScheduler::ScheduledActionDrawAndSwapIfPossible() {
-  base::TimeTicks start = base::TimeTicks::Now();
   for (const auto& it : displays_) {
     it->DrawAndSwap();
   }
-  base::TimeDelta duration = base::TimeTicks::Now() - start;
-
-  draw_estimate_ = (duration + draw_estimate_) / 2;
   return cc::DRAW_SUCCESS;
 }
 
@@ -98,18 +97,6 @@ void SurfacesScheduler::ScheduledActionInvalidateOutputSurface() {
 void SurfacesScheduler::DidAnticipatedDrawTimeChange(base::TimeTicks time) {
 }
 
-base::TimeDelta SurfacesScheduler::DrawDurationEstimate() {
-  return draw_estimate_;
-}
-
-base::TimeDelta SurfacesScheduler::BeginMainFrameToCommitDurationEstimate() {
-  return base::TimeDelta();
-}
-
-base::TimeDelta SurfacesScheduler::CommitToActivateDurationEstimate() {
-  return base::TimeDelta();
-}
-
 void SurfacesScheduler::SendBeginFramesToChildren(
     const cc::BeginFrameArgs& args) {
 }