cc: Add mailbox support to ResourceProvider write locks.

cc/raster/one_copy_raster_buffer_provider.h

Index: cc/raster/one_copy_raster_buffer_provider.h
diff --git a/cc/raster/one_copy_raster_buffer_provider.h b/cc/raster/one_copy_raster_buffer_provider.h
index d30c3b59a6f8dc472305745898bcb8c32163630a..8b0472639a8e779fde11e67e7dca05415e6a6977 100644
--- a/cc/raster/one_copy_raster_buffer_provider.h
+++ b/cc/raster/one_copy_raster_buffer_provider.h
@@ -12,6 +12,7 @@
 #include "cc/raster/raster_buffer_provider.h"
 #include "cc/raster/staging_buffer_pool.h"
 #include "cc/resources/resource_provider.h"
+#include "gpu/command_buffer/common/sync_token.h"
 
 namespace cc {
 struct StagingBuffer;
@@ -27,7 +28,8 @@ class CC_EXPORT OneCopyRasterBufferProvider : public RasterBufferProvider {
                               int max_copy_texture_chromium_size,
                               bool use_partial_raster,
                               int max_staging_buffer_usage_in_bytes,
-                              ResourceFormat preferred_tile_format);
+                              ResourceFormat preferred_tile_format,
+                              bool async_worker_context_enabled);
   ~OneCopyRasterBufferProvider() override;
 
   // Overridden from RasterBufferProvider:
@@ -45,6 +47,7 @@ class CC_EXPORT OneCopyRasterBufferProvider : public RasterBufferProvider {
   void PlaybackAndCopyOnWorkerThread(
       const Resource* resource,
       ResourceProvider::ScopedWriteLockGL* resource_lock,
+      const gpu::SyncToken& sync_token,
       const RasterSource* raster_source,
       const gfx::Rect& raster_full_rect,
       const gfx::Rect& raster_dirty_rect,
@@ -65,8 +68,8 @@ class CC_EXPORT OneCopyRasterBufferProvider : public RasterBufferProvider {
       uint64_t previous_content_id,
       uint64_t new_content_id);
   void CopyOnWorkerThread(StagingBuffer* staging_buffer,
-                          const Resource* resource,
                           ResourceProvider::ScopedWriteLockGL* resource_lock,
+                          const gpu::SyncToken& sync_token,
                           const RasterSource* raster_source,
                           uint64_t previous_content_id,
                           uint64_t new_content_id);
@@ -75,14 +78,18 @@ class CC_EXPORT OneCopyRasterBufferProvider : public RasterBufferProvider {
   ContextProvider* const worker_context_provider_;
   ResourceProvider* const resource_provider_;
   const int max_bytes_per_copy_operation_;
-  bool use_partial_raster_;
+  const bool use_partial_raster_;
 
   // Context lock must be acquired when accessing this member.
   int bytes_scheduled_since_last_flush_;
 
-  ResourceFormat preferred_tile_format_;
+  const ResourceFormat preferred_tile_format_;
   StagingBufferPool staging_pool_;
 
+  const bool async_worker_context_enabled_;
+
+  std::set<RasterBuffer*> pending_raster_buffers_;
+
   DISALLOW_COPY_AND_ASSIGN(OneCopyRasterBufferProvider);
 };