Delay activation/draw on GPU tile work completion

cc/test/fake_raster_buffer_provider.h

Index: cc/test/fake_raster_buffer_provider.h
diff --git a/cc/test/fake_raster_buffer_provider.h b/cc/test/fake_raster_buffer_provider.h
index cb0c6342081c3fcc8ef932ffcd15a37bc4a9ddc4..c279cb6638699036be4dcc18ba6b3c640dbe552e 100644
--- a/cc/test/fake_raster_buffer_provider.h
+++ b/cc/test/fake_raster_buffer_provider.h
@@ -25,6 +25,10 @@ class FakeRasterBufferProviderImpl : public RasterBufferProvider {
   ResourceFormat GetResourceFormat(bool must_support_alpha) const override;
   bool IsResourceSwizzleRequired(bool must_support_alpha) const override;
   bool CanPartialRasterIntoProvidedResource() const override;
+  uint64_t SetReadyToDrawCallback(
+      const ResourceProvider::ResourceIdArray& resource_ids,
+      const base::Callback<void(uint64_t)>& callback,
+      uint64_t pending_callback_id) const override;
   void Shutdown() override;
 };