cc: Make separate interface for BeginFrame ipc from OutputSurface

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 542143cea7af64c6cfc63ed93ba67bb66b77e5e8..ebc845723a6b6612a5b1c2f5fbecae5acbad0de5 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -225,8 +225,7 @@ LayerTreeHostImpl::LayerTreeHostImpl(
     RenderingStatsInstrumentation* rendering_stats_instrumentation,
     SharedBitmapManager* manager,
     int id)
-    : BeginFrameSourceMixIn(),
-      client_(client),
+    : client_(client),
       proxy_(proxy),
       use_gpu_rasterization_(false),
       input_handler_client_(NULL),
@@ -1398,10 +1397,6 @@ void LayerTreeHostImpl::SetNeedsRedrawRect(const gfx::Rect& damage_rect) {
   client_->SetNeedsRedrawRectOnImplThread(damage_rect);
 }
 
-void LayerTreeHostImpl::BeginFrame(const BeginFrameArgs& args) {
-  CallOnBeginFrame(args);
-}
-
 void LayerTreeHostImpl::DidSwapBuffers() {
   client_->DidSwapBuffersOnImplThread();
 }
@@ -1639,13 +1634,6 @@ bool LayerTreeHostImpl::SwapBuffers(const LayerTreeHostImpl::FrameData& frame) {
   return true;
 }
 
-void LayerTreeHostImpl::OnNeedsBeginFramesChange(bool 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.
@@ -3148,10 +3136,6 @@ BeginFrameArgs LayerTreeHostImpl::CurrentBeginFrameArgs() const {
                                 BeginFrameArgs::DefaultInterval());
 }
 
-void LayerTreeHostImpl::AsValueInto(base::debug::TracedValue* value) const {
-  return AsValueWithFrameInto(NULL, value);
-}
-
 scoped_refptr<base::debug::ConvertableToTraceFormat>
 LayerTreeHostImpl::AsValue() const {
   return AsValueWithFrame(NULL);