RendererCompositorFrameSink should receive BeginFrame messages

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index a8e68f87d649f26e625c99ac7b0ecdb1b3fd6611..a922a3d6b182c77e14f82c115723909e82fb149d 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -74,6 +74,7 @@ class Thread;
 namespace cc {
 class BeginFrameSource;
 class CompositorFrameSink;
+class SyntheticBeginFrameSource;
 class TaskGraphRunner;
 }
 
@@ -589,6 +590,9 @@ class CONTENT_EXPORT RenderThreadImpl
   std::unique_ptr<cc::BeginFrameSource> CreateExternalBeginFrameSource(
       int routing_id);
 
+  std::unique_ptr<cc::SyntheticBeginFrameSource>
+  CreateSyntheticBeginFrameSource();
+
   void OnRendererInterfaceRequest(mojom::RendererAssociatedRequest request);
 
   std::unique_ptr<discardable_memory::ClientDiscardableSharedMemoryManager>