Support additional mash shelf alignments.

mash/wm/root_window_controller.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MASH_WM_ROOT_WINDOW_CONTROLLER_H_
 #define MASH_WM_ROOT_WINDOW_CONTROLLER_H_
 
 #include <memory>
 
 #include "components/mus/public/cpp/window_observer.h"
@@ skipping 48 matching lines @@
   mus::Window* GetWindowForContainer(mojom::Container container);
   mus::Window* GetWindowById(mus::Id id);
   bool WindowIsContainer(const mus::Window* window) const;
 
   WindowManager* window_manager() { return window_manager_.get(); }
 
   mus::WindowManagerClient* window_manager_client();
 
   void OnAccelerator(uint32_t id, const ui::Event& event);
 
+  LayoutManager* GetLayoutManagerForContainer(mojom::Container container);
+
  private:
   explicit RootWindowController(WindowManagerApplication* app);
   ~RootWindowController() override;
 
   void AddAccelerators();
 
   // WindowTreeDelegate:
   void OnEmbed(mus::Window* root) override;
   void OnConnectionLost(mus::WindowTreeConnection* connection) override;
 
@@ skipping 17 matching lines @@
 
   mus::mojom::DisplayPtr display_;
 
   DISALLOW_COPY_AND_ASSIGN(RootWindowController);
 };
 
 }  // namespace wm
 }  // namespace mash
 
 #endif  // MASH_WM_ROOT_WINDOW_CONTROLLER_H_