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

cc/trees/single_thread_proxy.cc

Index: cc/trees/single_thread_proxy.cc
diff --git a/cc/trees/single_thread_proxy.cc b/cc/trees/single_thread_proxy.cc
index 3f2dc051a9ec01cc628775c6e0f6d25c73823df2..fe3bac3a8f6b00b7e8ef3fe0fb55cec9ad2f95bb 100644
--- a/cc/trees/single_thread_proxy.cc
+++ b/cc/trees/single_thread_proxy.cc
@@ -509,6 +509,10 @@ void SingleThreadProxy::DidSwapBuffersCompleteOnImplThread() {
   layer_tree_host_->DidCompleteSwapBuffers();
 }
 
+void SingleThreadProxy::OnDrawForOutputSurface() {
+  NOTREACHED() << "Implemented by ThreadProxy for synchronous compositor.";
+}
+
 void SingleThreadProxy::CompositeImmediately(base::TimeTicks frame_begin_time) {
   TRACE_EVENT0("cc,benchmark", "SingleThreadProxy::CompositeImmediately");
   DCHECK(Proxy::IsMainThread());
@@ -525,7 +529,7 @@ void SingleThreadProxy::CompositeImmediately(base::TimeTicks frame_begin_time) {
   {
     BeginFrameArgs begin_frame_args(BeginFrameArgs::Create(
         BEGINFRAME_FROM_HERE, frame_begin_time, base::TimeTicks(),
-        BeginFrameArgs::DefaultInterval(), BeginFrameArgs::SYNCHRONOUS));
+        BeginFrameArgs::DefaultInterval(), BeginFrameArgs::NORMAL));
     DoBeginMainFrame(begin_frame_args);
     DoCommit();
 
@@ -807,6 +811,11 @@ void SingleThreadProxy::ScheduledActionPrepareTiles() {
   layer_tree_host_impl_->PrepareTiles();
 }
 
+void SingleThreadProxy::ScheduledActionInvalidateOutputSurface() {
+  DCHECK(layer_tree_host_impl_->output_surface());
+  layer_tree_host_impl_->output_surface()->Invalidate();
+}
+
 void SingleThreadProxy::DidAnticipatedDrawTimeChange(base::TimeTicks time) {
 }