Enable BeginFrame scheduling on aura

content/browser/compositor/delegated_frame_host.cc

Index: content/browser/compositor/delegated_frame_host.cc
diff --git a/content/browser/compositor/delegated_frame_host.cc b/content/browser/compositor/delegated_frame_host.cc
index 026e0e0dba7c2dedfe362aa361ca5f1130d9162b..8b283617d20758e9a231a918700697b9d1cf1cb0 100644
--- a/content/browser/compositor/delegated_frame_host.cc
+++ b/content/browser/compositor/delegated_frame_host.cc
@@ -214,6 +214,13 @@ void DelegatedFrameHost::EndFrameSubscription() {
   frame_subscriber_.reset();
 }
 
+void DelegatedFrameHost::UpdateVSyncParameters(
+    base::TimeTicks timebase,
+    base::TimeDelta interval) {
+  vsync_timebase_ = timebase;
+  vsync_interval_ = interval;
+}
+
 bool DelegatedFrameHost::ShouldSkipFrame(gfx::Size size_in_dip) const {
   // Should skip a frame only when another frame from the renderer is guaranteed
   // to replace it. Otherwise may cause hangs when the renderer is waiting for
@@ -942,8 +949,11 @@ DelegatedFrameHost::~DelegatedFrameHost() {
     surface_factory_->Destroy(surface_id_);
   if (resource_collection_.get())
     resource_collection_->SetClient(NULL);
-
+  // TODO(simonhong): Remove vsync manager when BeginFrame scheduling is enabled
+  // on all platform.
+#if 0
   DCHECK(!vsync_manager_.get());
+#endif
 }
 
 void DelegatedFrameHost::RunOnCommitCallbacks() {
@@ -970,9 +980,11 @@ void DelegatedFrameHost::SetCompositor(ui::Compositor* compositor) {
     return;
   compositor_ = compositor;
   compositor_->AddObserver(this);
+#if 0

[danakj, 2015/03/24 17:46:24]

I'm not sure what is going on in this CL sorry. You should remove code not if 0
it.

I don't understand why you want to remove things on ash either. I need some
explanations..

   DCHECK(!vsync_manager_.get());
   vsync_manager_ = compositor_->vsync_manager();
   vsync_manager_->AddObserver(this);
+#endif
 }
 
 void DelegatedFrameHost::ResetCompositor() {
@@ -985,10 +997,12 @@ void DelegatedFrameHost::ResetCompositor() {
   }
   if (compositor_->HasObserver(this))
     compositor_->RemoveObserver(this);
+#if 0
   if (vsync_manager_.get()) {
     vsync_manager_->RemoveObserver(this);
     vsync_manager_ = NULL;
   }
+#endif
   compositor_ = nullptr;
 }