Allow layers to signal that additional sequences are needed before surface destruction

ui/compositor/compositor.h

Index: ui/compositor/compositor.h
diff --git a/ui/compositor/compositor.h b/ui/compositor/compositor.h
index 065e8b42f2567f90bfdef3b4ac3ec8b84d216c25..a6520a2a3a996368c790786c4a547259f8f2ee4b 100644
--- a/ui/compositor/compositor.h
+++ b/ui/compositor/compositor.h
@@ -275,10 +275,6 @@ class COMPOSITOR_EXPORT Compositor
     return &layer_animator_collection_;
   }
 
-  // Inserts a SurfaceSequence that will be satisfied on the next frame this
-  // compositor commits and swaps.
-  cc::SurfaceSequence InsertSurfaceSequenceForNextFrame();
-
   cc::SurfaceIdAllocator* surface_id_allocator() {
     return surface_id_allocator_.get();
   }
@@ -308,7 +304,6 @@ class COMPOSITOR_EXPORT Compositor
 
   gfx::AcceleratedWidget widget_;
   scoped_ptr<cc::SurfaceIdAllocator> surface_id_allocator_;
-  uint32_t surface_sequence_number_;
   scoped_refptr<cc::Layer> root_web_layer_;
   scoped_ptr<cc::LayerTreeHost> host_;
   scoped_refptr<base::MessageLoopProxy> compositor_thread_loop_;