Making OutputSurface a begin frame source and vsync source.

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 08dce4aa6328e9a0ddf0d29f8ec9de152eda4eda..2f1553bd73cd1ed96933353eb23dba7ce77676dc 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -1431,10 +1431,6 @@ void LayerTreeHostImpl::SetNeedsRedrawRect(const gfx::Rect& damage_rect) {
   client_->SetNeedsRedrawRectOnImplThread(damage_rect);
 }
 
-void LayerTreeHostImpl::BeginFrame(const BeginFrameArgs& args) {
-  SendBeginFrame(args);
-}
-
 void LayerTreeHostImpl::DidSwapBuffers() {
   client_->DidSwapBuffersOnImplThread();
 }
@@ -1672,18 +1668,6 @@ bool LayerTreeHostImpl::SwapBuffers(const LayerTreeHostImpl::FrameData& frame) {
   return true;
 }
 
-bool LayerTreeHostImpl::NeedsBeginFrames() const {
-  return needs_begin_frames_;
-}
-
-void LayerTreeHostImpl::SetNeedsBeginFrames(bool enable) {
-  needs_begin_frames_ = enable;
-  if (output_surface_)
-    output_surface_->SetNeedsBeginFrame(enable);
-  else
-    DCHECK(!enable);
-}
-
 void LayerTreeHostImpl::WillBeginImplFrame(const BeginFrameArgs& args) {
   // Sample the frame time now. This time will be used for updating animations
   // when we draw.
@@ -2103,12 +2087,6 @@ bool LayerTreeHostImpl::InitializeRenderer(
   if (settings_.impl_side_painting)
     CreateAndSetTileManager();
 
-  // Initialize vsync parameters to sane values.
-  const base::TimeDelta display_refresh_interval =
-      base::TimeDelta::FromMicroseconds(base::Time::kMicrosecondsPerSecond /
-                                        settings_.refresh_rate);
-  CommitVSyncParameters(base::TimeTicks(), display_refresh_interval);
-
   // TODO(brianderson): Don't use a hard-coded parent draw time.
   base::TimeDelta parent_draw_time =
       (!settings_.begin_frame_scheduling_enabled &&
@@ -2126,11 +2104,6 @@ bool LayerTreeHostImpl::InitializeRenderer(
   return true;
 }
 
-void LayerTreeHostImpl::CommitVSyncParameters(base::TimeTicks timebase,
-                                              base::TimeDelta interval) {
-  client_->CommitVSyncParameters(timebase, interval);
-}
-
 void LayerTreeHostImpl::DeferredInitialize() {
   DCHECK(output_surface_->capabilities().deferred_gl_initialization);
   DCHECK(settings_.impl_side_painting);