WIP: Propagate SurfaceID up window tree hierarchy

services/ui/ws/window_tree.h

Index: services/ui/ws/window_tree.h
diff --git a/services/ui/ws/window_tree.h b/services/ui/ws/window_tree.h
index cb34fcbfcc23545173c9b3daa24cc9e274fd9017..5a3ee39af4a2d32102c9392362cf338fe85dea34 100644
--- a/services/ui/ws/window_tree.h
+++ b/services/ui/ws/window_tree.h
@@ -214,6 +214,13 @@ class WindowTree : public mojom::WindowTree,
                                   const gfx::Rect& old_bounds,
                                   const gfx::Rect& new_bounds,
                                   bool originated_change);
+
+  void ProcessWindowSurfaceCreated(const ServerWindow* window,
+                                   const gfx::Size& size,
+                                   float device_scale_factor,
+                                   const cc::SurfaceId& surface_id,
+                                   const cc::SurfaceSequence& surface_sequence);
+
   void ProcessClientAreaChanged(
       const ServerWindow* window,
       const gfx::Insets& new_client_area,
@@ -413,6 +420,8 @@ class WindowTree : public mojom::WindowTree,
                      mojom::SurfaceType type,
                      mojo::InterfaceRequest<mojom::Surface> surface,
                      mojom::SurfaceClientPtr client) override;
+  void SatisfySurfaceSequence(Id transport_window_id,
+                              const cc::SurfaceSequence& sequence) override;
   void Embed(Id transport_window_id,
              mojom::WindowTreeClientPtr client,
              uint32_t flags,