Decouple GpuCompositorFrameSink from DisplayCompositor

cc/surfaces/surface_manager.h

Index: cc/surfaces/surface_manager.h
diff --git a/cc/surfaces/surface_manager.h b/cc/surfaces/surface_manager.h
index ef6a73512a363292dee334deb02120c6aa0165a5..b5e2e5dd7d48398cc6abd01e602438a46b483fb8 100644
--- a/cc/surfaces/surface_manager.h
+++ b/cc/surfaces/surface_manager.h
@@ -129,6 +129,10 @@ class CC_SURFACES_EXPORT SurfaceManager
                            const SurfaceId& child_id) override;
   void RemoveSurfaceReference(const SurfaceId& parent_id,
                               const SurfaceId& child_id) override;
+  void AddSurfaceReferences(
+      const std::vector<SurfaceReference>& references) override;
+  void RemoveSurfaceReferences(
+      const std::vector<SurfaceReference>& references) override;
   size_t GetSurfaceReferenceCount(const SurfaceId& surface_id) const override;
   size_t GetReferencedSurfaceCount(const SurfaceId& surface_id) const override;