cc: Add ScopedWriteLock classes for raster to GpuMemoryBuffer or using Ganesh.

cc/resources/raster_worker_pool.h

 // Copyright 2013 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_RESOURCES_RASTER_WORKER_POOL_H_
 #define CC_RESOURCES_RASTER_WORKER_POOL_H_
 
 #include "cc/resources/rasterizer.h"
 #include "ui/gfx/geometry/size.h"
 
@@ skipping 46 matching lines @@
   // represent |task| and all its image decode dependencies in |graph|.
   static void InsertNodesForRasterTask(
       TaskGraph* graph,
       RasterTask* task,
       const ImageDecodeTask::Vector& decode_tasks,
       unsigned priority);
 
   // Utility functions that transparently create a temporary bitmap and copy
   // pixels to buffer when necessary.
   static void AcquireBitmapForBuffer(SkBitmap* bitmap,
-                                     uint8_t* buffer,
+                                     void* buffer,
                                      ResourceFormat format,
                                      const gfx::Size& size,
                                      int stride);
   static void ReleaseBitmapForBuffer(SkBitmap* bitmap,
-                                     uint8_t* buffer,
+                                     void* buffer,
                                      ResourceFormat format);
 
   // Type-checking downcast routine.
   virtual Rasterizer* AsRasterizer() = 0;
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RASTER_WORKER_POOL_H_