cc: Add mailbox support to ResourceProvider write locks.

cc/raster/bitmap_raster_buffer_provider.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 "cc/raster/bitmap_raster_buffer_provider.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 38 matching lines @@
     DCHECK(!playback_rect.IsEmpty())
         << "Why are we rastering a tile that's not dirty?";
 
     size_t stride = 0u;
     RasterBufferProvider::PlaybackToMemory(
         lock_.sk_bitmap().getPixels(), resource_->format(), resource_->size(),
         stride, raster_source, raster_full_rect, playback_rect, scale,
         playback_settings);
   }
 
+  void SetSyncToken(const gpu::SyncToken& sync_token) override { NOTREACHED(); }
+
  private:
   ResourceProvider::ScopedWriteLockSoftware lock_;
   const Resource* resource_;
   bool resource_has_previous_content_;
 
   DISALLOW_COPY_AND_ASSIGN(RasterBufferImpl);
 };
 
 }  // namespace
 
@@ skipping 34 matching lines @@
 }
 
 bool BitmapRasterBufferProvider::GetResourceRequiresSwizzle(
     bool must_support_alpha) const {
   return ResourceFormatRequiresSwizzle(GetResourceFormat(must_support_alpha));
 }
 
 void BitmapRasterBufferProvider::Shutdown() {}
 
 }  // namespace cc