Moves accelerator registration to WindowManager

mash/wm/root_window_controller.h

Index: mash/wm/root_window_controller.h
diff --git a/mash/wm/root_window_controller.h b/mash/wm/root_window_controller.h
index c70ac8311d696ad64d5a076dd21a798823674555..bacd5280f161d7398a3c17c065a98099e124e684 100644
--- a/mash/wm/root_window_controller.h
+++ b/mash/wm/root_window_controller.h
@@ -56,11 +56,15 @@ class RootWindowController : public mus::WindowObserver,
   mus::Window* GetWindowById(mus::Id id);
   bool WindowIsContainer(const mus::Window* window) const;
 
+  WindowManager* window_manager() { return window_manager_.get(); }
+
   // TODO(sky): don't expose this, it may be null.
   mus::mojom::WindowTreeHost* window_tree_host() {
     return window_tree_host_.get();
   }
 
+  void OnAccelerator(uint32_t id, mus::mojom::EventPtr event);
+
  private:
   explicit RootWindowController(WindowManagerApplication* app);
   ~RootWindowController() override;
@@ -70,9 +74,6 @@ class RootWindowController : public mus::WindowObserver,
   // Sets up the window containers used for z-space management.
   void CreateContainers();
 
-  // WindowTreeHostClient:
-  void OnAccelerator(uint32_t id, mus::mojom::EventPtr event) override;
-
   // WindowTreeDelegate:
   void OnEmbed(mus::Window* root) override;
   void OnConnectionLost(mus::WindowTreeConnection* connection) override;