Delay activation/draw on GPU tile work completion

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 e1fa6665eb2df876c2a0fad9da250dd07cb50cb3..22e0dd58f39f28170f5b677d1f403f41ce670dca 100644
--- a/cc/raster/one_copy_raster_buffer_provider.h
+++ b/cc/raster/one_copy_raster_buffer_provider.h
@@ -41,6 +41,11 @@ class CC_EXPORT OneCopyRasterBufferProvider : public RasterBufferProvider {
   ResourceFormat GetResourceFormat(bool must_support_alpha) const override;
   bool IsResourceSwizzleRequired(bool must_support_alpha) const override;
   bool CanPartialRasterIntoProvidedResource() const override;
+  bool IsResourceReadyToDraw(ResourceId id) const override;
+  uint64_t SetReadyToDrawCallback(
+      const ResourceProvider::ResourceIdArray& resource_ids,
+      const base::Closure& callback,
+      uint64_t pending_callback_id) const override;
   void Shutdown() override;
 
   // Playback raster source and copy result into |resource|.