cc: Make scheduling be driven by vsync for android webview.

content/browser/android/in_process/synchronous_compositor_external_begin_frame_source.cc

Index: content/browser/android/in_process/synchronous_compositor_external_begin_frame_source.cc
diff --git a/content/browser/android/in_process/synchronous_compositor_external_begin_frame_source.cc b/content/browser/android/in_process/synchronous_compositor_external_begin_frame_source.cc
index 0c272fd358af42ff8789ad2ba672d74ed55d49b4..c860f06fba2777a6d9b330c1975f37697c829d25 100644
--- a/content/browser/android/in_process/synchronous_compositor_external_begin_frame_source.cc
+++ b/content/browser/android/in_process/synchronous_compositor_external_begin_frame_source.cc
@@ -30,23 +30,41 @@ SynchronousCompositorExternalBeginFrameSource::
   DCHECK(!compositor_);
 }
 
-void SynchronousCompositorExternalBeginFrameSource::BeginFrame() {
+void SynchronousCompositorExternalBeginFrameSource::SendBeginFrameNow() {
   DCHECK(CalledOnValidThread());
+  DCHECK(!inside_begin_frame_);
+  inside_begin_frame_ = true;
   CallOnBeginFrame(cc::BeginFrameArgs::Create(
       BEGINFRAME_FROM_HERE, gfx::FrameTime::Now(), base::TimeTicks(),
       cc::BeginFrameArgs::DefaultInterval(), cc::BeginFrameArgs::SYNCHRONOUS));
 }
 
+void SynchronousCompositorExternalBeginFrameSource::SendBeginFrame(
+    base::TimeTicks frame_time, base::TimeDelta vsync_period) {
+  DCHECK(CalledOnValidThread());
+  DCHECK(!inside_begin_frame_);
+  inside_begin_frame_ = true;
+  CallOnBeginFrame(cc::BeginFrameArgs::Create(
+      BEGINFRAME_FROM_HERE, frame_time, base::TimeTicks(), vsync_period,
+      cc::BeginFrameArgs::SYNCHRONOUS));
+}
+
 void SynchronousCompositorExternalBeginFrameSource::SetCompositor(
     SynchronousCompositorImpl* compositor) {
   DCHECK(CalledOnValidThread());
   compositor_ = compositor;
 }
 
+void SynchronousCompositorExternalBeginFrameSource::DidFinishFrame(
+    size_t remaining_frames) {
+  DCHECK(CalledOnValidThread());
+  DCHECK(inside_begin_frame_);
+  inside_begin_frame_ = false;
+}
+
 void SynchronousCompositorExternalBeginFrameSource::OnNeedsBeginFramesChange(
     bool needs_begin_frames) {
   DCHECK(CalledOnValidThread());
-
   if (compositor_)
     compositor_->NeedsBeginFramesChanged();
 }