cc: Throttle swaps in Scheduler instead of OutputSurface

cc/output/output_surface_client.h

Index: cc/output/output_surface_client.h
diff --git a/cc/output/output_surface_client.h b/cc/output/output_surface_client.h
index 7e509a8269ec9f255ece21b101699ca1407c2109..ccfa12a2d25d7f0ccc7e585d45fb574f925af13e 100644
--- a/cc/output/output_surface_client.h
+++ b/cc/output/output_surface_client.h
@@ -11,6 +11,7 @@
 #include "cc/base/cc_export.h"
 #include "cc/output/begin_frame_args.h"
 #include "cc/output/context_provider.h"
+#include "cc/scheduler/frame_rate_controller.h"
 #include "ui/gfx/rect.h"
 
 namespace gfx {
@@ -22,7 +23,7 @@ namespace cc {
 class CompositorFrameAck;
 struct ManagedMemoryPolicy;
 
-class CC_EXPORT OutputSurfaceClient {
+class CC_EXPORT OutputSurfaceClient : public BeginFrameSourceClient {
  public:
   // Called to synchronously re-initialize using the Context3D. Upon returning
   // the compositor should be able to draw using GL what was previously
@@ -30,6 +31,8 @@ class CC_EXPORT OutputSurfaceClient {
   virtual bool DeferredInitialize(
       scoped_refptr<ContextProvider> offscreen_context_provider) = 0;
   virtual void ReleaseGL() = 0;
+  virtual void CommitVSyncParameters(base::TimeTicks timebase,
+                                     base::TimeDelta interval);
   virtual void SetNeedsRedrawRect(const gfx::Rect& damage_rect) = 0;
   virtual void BeginImplFrame(const BeginFrameArgs& args) = 0;
   virtual void DidSwapBuffers() = 0;