Ozone: Avoid blocking in Swapbuffer Call.

content/browser/compositor/buffer_queue.h

 // 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.
 
 #ifndef CONTENT_BROWSER_COMPOSITOR_BUFFERED_OUTPUT_SURFACE_H_
 #define CONTENT_BROWSER_COMPOSITOR_BUFFERED_OUTPUT_SURFACE_H_
 
 #include <queue>
 #include <vector>
 
@@ skipping 62 matching lines @@
   AllocatedSurface GetNextSurface();
 
   gfx::Size size_;
   scoped_refptr<cc::ContextProvider> context_provider_;
   unsigned int fbo_;
   size_t allocated_count_;
   unsigned int internalformat_;
   AllocatedSurface current_surface_;  // This surface is currently bound.
   std::vector<AllocatedSurface> available_surfaces_;  // These are free for use.
   std::deque<AllocatedSurface> in_flight_surfaces_;
+  std::deque<AllocatedSurface> display_queue_surfaces_;
   GLHelper* gl_helper_;
 
   DISALLOW_COPY_AND_ASSIGN(BufferQueue);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_COMPOSITOR_BUFFERED_OUTPUT_SURFACE_H_