Limit outstanding surface draw swaps to max_frames_pending.

mojo/services/surfaces/surfaces_impl.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 "mojo/services/surfaces/surfaces_impl.h"
 
 #include "cc/output/compositor_frame.h"
 #include "cc/resources/returned_resource.h"
 #include "cc/surfaces/display.h"
 #include "cc/surfaces/surface_id_allocator.h"
@@ skipping 80 matching lines @@
 }
 
 scoped_ptr<cc::OutputSurface> SurfacesImpl::CreateOutputSurface() {
   return make_scoped_ptr(new cc::OutputSurface(
       new ContextProviderMojo(command_buffer_handle_.Pass())));
 }
 
 void SurfacesImpl::DisplayDamaged() {
 }
 
+void SurfacesImpl::DidSwapBuffers() {
+}
+
+void SurfacesImpl::DidSwapBuffersComplete() {
+}
+
 }  // namespace mojo