mash: Create and show a shelf in mash.

ash/mus/bridge/wm_shelf_mus.h

Index: ash/mus/bridge/wm_shelf_mus.h
diff --git a/ash/mus/bridge/wm_shelf_mus.h b/ash/mus/bridge/wm_shelf_mus.h
index 5db4d2b94b929bbdc498e2bc80cc5e09e454c1ed..c3571e98ac9d02e7f953b83dc463059db1a415d5 100644
--- a/ash/mus/bridge/wm_shelf_mus.h
+++ b/ash/mus/bridge/wm_shelf_mus.h
@@ -7,13 +7,10 @@
 
 #include "ash/common/shelf/wm_shelf.h"
 #include "base/macros.h"
-#include "base/observer_list.h"
-
-namespace views {
-class Widget;
-}
 
 namespace ash {
+
+class ShelfWidget;
 class WmRootWindowController;
 
 namespace mus {
@@ -24,37 +21,9 @@ class WmShelfMus : public WmShelf {
   WmShelfMus(WmRootWindowController* root_window_controller);
   ~WmShelfMus() override;
 
-  // WmShelf:
-  WmWindow* GetWindow() override;
-  ShelfAlignment GetAlignment() const override;
-  void SetAlignment(ShelfAlignment alignment) override;
-  ShelfAutoHideBehavior GetAutoHideBehavior() const override;
-  void SetAutoHideBehavior(ShelfAutoHideBehavior behavior) override;
-  ShelfAutoHideState GetAutoHideState() const override;
-  void UpdateAutoHideState() override;
-  ShelfBackgroundType GetBackgroundType() const override;
-  WmDimmerView* CreateDimmerView(bool disable_animations_for_test) override;
-  bool IsDimmed() const override;
-  void SchedulePaint() override;
-  bool IsVisible() const override;
-  void UpdateVisibilityState() override;
-  ShelfVisibilityState GetVisibilityState() const override;
-  gfx::Rect GetIdealBounds() override;
-  gfx::Rect GetUserWorkAreaBounds() const override;
-  void UpdateIconPositionForWindow(WmWindow* window) override;
-  gfx::Rect GetScreenBoundsOfItemIconForWindow(WmWindow* window) override;
-  bool ProcessGestureEvent(const ui::GestureEvent& event) override;
-  void AddObserver(WmShelfObserver* observer) override;
-  void RemoveObserver(WmShelfObserver* observer) override;
-  void SetKeyboardBoundsForTesting(const gfx::Rect& bounds) override;
-  ShelfLockingManager* GetShelfLockingManagerForTesting() override;
-  ShelfView* GetShelfViewForTesting() override;
-
  private:
-  base::ObserverList<WmShelfObserver> observers_;
-
-  // Owned by native widget.
-  views::Widget* shelf_widget_;
+  // The shelf widget for this shelf.
+  std::unique_ptr<ShelfWidget> shelf_widget_;
 
   DISALLOW_COPY_AND_ASSIGN(WmShelfMus);
 };