cc: Add queue of BeginFrames to support long deadlines.

cc/trees/layer_tree_host_impl.cc

 // Copyright 2011 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/trees/layer_tree_host_impl.h"
 
 #include <algorithm>
 
 #include "base/basictypes.h"
 #include "base/json/json_writer.h"
@@ skipping 1631 matching lines @@
     output_surface->InitializeBeginFrameEmulation(
         proxy_->ImplThreadTaskRunner(),
         settings_.throttle_frame_production,
         display_refresh_interval);
   }
 
   int max_frames_pending =
       output_surface->capabilities().max_frames_pending;
   if (max_frames_pending <= 0)
     max_frames_pending = OutputSurface::DEFAULT_MAX_FRAMES_PENDING;
+  max_frames_pending = 2;
   output_surface->SetMaxFramesPending(max_frames_pending);
 
   resource_provider_ = resource_provider.Pass();
   output_surface_ = output_surface.Pass();
   output_surface_lost_ = false;
 
   client_->OnCanDrawStateChanged(CanDraw());
 
   // See note in LayerTreeImpl::UpdateDrawProperties.  Renderer needs
   // to be initialized to get max texture size.
@@ skipping 841 matching lines @@
 
 ResourceProvider::ResourceId LayerTreeHostImpl::ResourceIdForUIResource(
     UIResourceId uid) const {
   UIResourceMap::const_iterator iter = ui_resource_map_.find(uid);
   if (iter != ui_resource_map_.end())
     return iter->second;
   return 0;
 }
 
 }  // namespace cc