Add callback when queueing frame on Surface to create backpressure.

cc/surfaces/surface.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/surfaces/surface.h"
 
 #include "cc/output/compositor_frame.h"
 #include "cc/surfaces/surface_factory.h"
 
 namespace cc {
 
 Surface::Surface(SurfaceId id, const gfx::Size& size, SurfaceFactory* factory)
     : surface_id_(id), size_(size), factory_(factory) {
 }
 
 Surface::~Surface() {
   if (current_frame_) {
     ReturnedResourceArray current_resources;
     TransferableResource::ReturnResources(
         current_frame_->delegated_frame_data->resource_list,
         &current_resources);
     factory_->UnrefResources(current_resources);
   }
 }
 
-void Surface::QueueFrame(scoped_ptr<CompositorFrame> frame) {
+void Surface::QueueFrame(scoped_ptr<CompositorFrame> frame,
+                         const base::Closure& callback) {
   scoped_ptr<CompositorFrame> previous_frame = current_frame_.Pass();
   current_frame_ = frame.Pass();
   factory_->ReceiveFromChild(
       current_frame_->delegated_frame_data->resource_list);
 
   if (previous_frame) {
     ReturnedResourceArray previous_resources;
     TransferableResource::ReturnResources(
         previous_frame->delegated_frame_data->resource_list,
         &previous_resources);
     factory_->UnrefResources(previous_resources);
   }
+  if (!draw_callback_.is_null())
+    draw_callback_.Run();
+  draw_callback_ = callback;
 }
 
 const CompositorFrame* Surface::GetEligibleFrame() {
   return current_frame_.get();
 }
 
+void Surface::RunDrawCallbacks() {
+  if (!draw_callback_.is_null()) {
+    base::Closure callback = draw_callback_;
+    draw_callback_ = base::Closure();
+    callback.Run();
+  }
+}
+
 }  // namespace cc