Remove dependency on SurfaceManager in FrameGenerator

services/ui/surfaces/display_compositor.h

Index: services/ui/surfaces/display_compositor.h
diff --git a/services/ui/surfaces/display_compositor.h b/services/ui/surfaces/display_compositor.h
index d899dc7251edc5b193ef3a66dc653fec32fd43d2..18ad01a7ff3a613e08a28f35f8e0443b913701c5 100644
--- a/services/ui/surfaces/display_compositor.h
+++ b/services/ui/surfaces/display_compositor.h
@@ -32,7 +32,11 @@ class DisplayCompositor : public cc::SurfaceObserver,
  public:
   explicit DisplayCompositor(cc::mojom::DisplayCompositorClientPtr client);
 
-  void ReturnSurfaceReference(const cc::SurfaceSequence& sequence);
+  // TODO(fsamuel):  These methods should be behind a mojo interface.
+  void AddSurfaceReference(const cc::SurfaceId& surface_id,
+                           const cc::SurfaceSequence& surface_sequence);
+  void ReturnSurfaceReferences(const cc::FrameSinkId& frame_sink_id,
+                               const std::vector<uint32_t>& sequences);
 
   cc::SurfaceManager* manager() { return &manager_; }