WIP: Propagate SurfaceID up window tree hierarchy

services/ui/ws/server_window_surface_manager.h

Index: services/ui/ws/server_window_surface_manager.h
diff --git a/services/ui/ws/server_window_surface_manager.h b/services/ui/ws/server_window_surface_manager.h
index 11d158068fb922cb7161f707980a7de19a2c5e18..afe24ddee9b1ceeae3727cfe01785cc4c32cacac 100644
--- a/services/ui/ws/server_window_surface_manager.h
+++ b/services/ui/ws/server_window_surface_manager.h
@@ -11,6 +11,7 @@
 #include "cc/ipc/compositor_frame.mojom.h"
 #include "cc/surfaces/surface_factory.h"
 #include "cc/surfaces/surface_id.h"
+#include "cc/surfaces/surface_sequence_generator.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "services/ui/public/interfaces/window_tree.mojom.h"
 
@@ -37,6 +38,12 @@ class ServerWindowSurfaceManager {
                      mojo::InterfaceRequest<mojom::Surface> request,
                      mojom::SurfaceClientPtr client);
 
+  // TODO(fsamuel): This is temporary until we replace SurfaceSequences with
+  // refcounting.
+  cc::SurfaceSequence CreateSurfaceSequence();
+
+  void SatisfySurfaceSequence(const cc::SurfaceSequence& sequence);
+
   ServerWindow* window() { return window_; }
 
   ServerWindowSurface* GetDefaultSurface() const;
@@ -56,6 +63,8 @@ class ServerWindowSurfaceManager {
   bool IsSurfaceReadyAndNonEmpty(mojom::SurfaceType type) const;
 
   ServerWindow* window_;
+  cc::FrameSinkId frame_sink_id_;
+  cc::SurfaceSequenceGenerator surface_sequence_generator_;
 
   using TypeToSurfaceMap =
       std::map<mojom::SurfaceType, std::unique_ptr<ServerWindowSurface>>;