cc: Add mailbox support to ResourceProvider write locks.

cc/raster/raster_buffer.h

Index: cc/raster/raster_buffer.h
diff --git a/cc/raster/raster_buffer.h b/cc/raster/raster_buffer.h
index 04972f9d73e11117f81753977b4289ef260c3997..442eb57551c017b831dda11765f7f967d20b83f1 100644
--- a/cc/raster/raster_buffer.h
+++ b/cc/raster/raster_buffer.h
@@ -9,6 +9,7 @@
 
 #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 {
@@ -25,6 +26,8 @@ class CC_EXPORT RasterBuffer {
       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