cc: Add mailbox support to ResourceProvider write locks.

cc/raster/raster_buffer.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 CC_RASTER_RASTER_BUFFER_H_
 #define CC_RASTER_RASTER_BUFFER_H_
 
 #include <stdint.h>
 
 #include "cc/base/cc_export.h"
 #include "cc/playback/raster_source.h"
+#include "gpu/command_buffer/common/sync_token.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace cc {
 
 class CC_EXPORT RasterBuffer {
  public:
   RasterBuffer();
   virtual ~RasterBuffer();
 
   virtual void Playback(
       const RasterSource* raster_source,
       const gfx::Rect& raster_full_rect,
       const gfx::Rect& raster_dirty_rect,
       uint64_t new_content_id,
       float scale,
       const RasterSource::PlaybackSettings& playback_settings) = 0;
+
+  virtual void SetSyncToken(const gpu::SyncToken& sync_token) = 0;

[piman, 2016/06/06 23:22:45]

Does this need to be in the interface? Both Gpu- and
OneCopy-RasterBufferProvider know the concrete type at construction time, so
they can keep the concrete type in their std::set, allowing SetSyncToken to be
non-virtual (and inline for that matter). It also avoids the NOTREACHED in the
other implementations.

[sunnyps, 2016/06/07 01:11:31]

Done.

 };
 
 }  // namespace cc
 
 #endif  // CC_RASTER_RASTER_BUFFER_H_