WIP: Propagate SurfaceID up window tree hierarchy

services/ui/public/cpp/window_tree_client.h

Index: services/ui/public/cpp/window_tree_client.h
diff --git a/services/ui/public/cpp/window_tree_client.h b/services/ui/public/cpp/window_tree_client.h
index 169e7725ca6e1a6030b7a8aeadaab5092837f16c..cb0f2a7941c10e0321b095287c909f01478d3d63 100644
--- a/services/ui/public/cpp/window_tree_client.h
+++ b/services/ui/public/cpp/window_tree_client.h
@@ -133,6 +133,9 @@ class WindowTreeClient : public mojom::WindowTreeClient,
                      mojo::InterfaceRequest<mojom::Surface> surface,
                      mojom::SurfaceClientPtr client);
 
+  void SatisfySurfaceSequence(Id window_id,
+                              const cc::SurfaceSequence& sequence);
+
   // Sets the input capture to |window| without notifying the server.
   void LocalSetCapture(Window* window);
   // Sets focus to |window| without notifying the server.
@@ -202,9 +205,13 @@ class WindowTreeClient : public mojom::WindowTreeClient,
 
   // Creates and returns a new Window (which is owned by the window server).
   // Windows are initially hidden, use SetVisible(true) to show.
+  Window* NewWindowContainer() {
+    return NewWindow(nullptr, true /* container */);
+  }
   Window* NewWindow() { return NewWindow(nullptr); }
   Window* NewWindow(
-      const std::map<std::string, std::vector<uint8_t>>* properties);
+      const std::map<std::string, std::vector<uint8_t>>* properties,
+      bool container = false);
   Window* NewTopLevelWindow(
       const std::map<std::string, std::vector<uint8_t>>* properties);
 
@@ -251,7 +258,8 @@ class WindowTreeClient : public mojom::WindowTreeClient,
                           Window* initial_parent);
 
   Window* NewWindowImpl(NewWindowType type,
-                        const Window::SharedProperties* properties);
+                        const Window::SharedProperties* properties,
+                        bool container = false);
 
   // Sets the mojom::WindowTree implementation.
   void SetWindowTree(mojom::WindowTreePtr window_tree_ptr);
@@ -295,6 +303,12 @@ class WindowTreeClient : public mojom::WindowTreeClient,
   void OnWindowBoundsChanged(Id window_id,
                              const gfx::Rect& old_bounds,
                              const gfx::Rect& new_bounds) override;
+  void OnWindowSurfaceCreated(
+      Id window_id,
+      const gfx::Size& size,
+      float device_scale_factor,
+      const cc::SurfaceId& surface_id,
+      const cc::SurfaceSequence& surface_sequence) override;
   void OnClientAreaChanged(
       uint32_t window_id,
       const gfx::Insets& new_client_area,