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 13 matching lines @@
 
 namespace ui {
 class Event;
 }
 
 namespace mash {
 namespace wm {
 
 class LayoutManager;
 class ShadowController;
+class ShelfLayout;
 class WindowManager;
 class WindowManagerApplication;
 
 // RootWindowController manages the windows and state for a single display.
 //
 // RootWindowController deletes itself when the root mus::Window is destroyed.
 // You can trigger deletion explicitly by way of Destroy().
 class RootWindowController : public mus::WindowObserver,
                              public mus::WindowTreeDelegate {
  public:
@@ skipping 14 matching lines @@
 
   mus::Window* GetWindowForContainer(mojom::Container container);
   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);
 
+  ShelfLayout* GetShelfLayoutManager();
+
  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_