[cc] Plumb BeginFrameAcks through SurfaceManager to DisplayScheduler.

cc/surfaces/surface_manager.h

Index: cc/surfaces/surface_manager.h
diff --git a/cc/surfaces/surface_manager.h b/cc/surfaces/surface_manager.h
index 293f4c8af80a037f6c3660f08cd02cb4b640e161..a9202d8a2065ffab62efbd92fc63ae5941650f56 100644
--- a/cc/surfaces/surface_manager.h
+++ b/cc/surfaces/surface_manager.h
@@ -101,6 +101,10 @@ class CC_SURFACES_EXPORT SurfaceManager {
   // Called when |surface| is being destroyed.
   void SurfaceDiscarded(Surface* surface);
 
+  // Called when the state of a Surface's CompositorFrame producer has changed.
+  void SurfaceProducerStateChanged(Surface* surface,
+                                   Surface::ProducerState state);
+
   // Require that the given sequence number must be satisfied (using
   // SatisfySequence) before the given surface can be destroyed.
   void RequireSequence(const SurfaceId& surface_id,