ash: Update app list button.

ash/wm/app_list_controller.h

Index: ash/wm/app_list_controller.h
diff --git a/ash/wm/app_list_controller.h b/ash/wm/app_list_controller.h
index d2408d8bac4afba0be8384b8eb541311b07a71eb..385e1e5af630ab2f75f3639907ac3e88e7ad55bf 100644
--- a/ash/wm/app_list_controller.h
+++ b/ash/wm/app_list_controller.h
@@ -9,6 +9,7 @@
 #include "ash/shell_observer.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/observer_list.h"
 #include "base/timer.h"
 #include "ui/app_list/pagination_model_observer.h"
 #include "ui/aura/client/focus_change_observer.h"
@@ -28,8 +29,13 @@ class LocatedEvent;
 }
 
 namespace ash {
+
+class Shell;
+
 namespace internal {
 
+class AppListControllerObserver;
+
 // AppListController is a controller that manages app list UI for shell.
 // It creates AppListView and schedules showing/hiding animation.
 // While the UI is visible, it monitors things such as app list widget's
@@ -43,9 +49,12 @@ class AppListController : public ui::EventHandler,
                           public LauncherIconObserver,
                           public app_list::PaginationModelObserver {
  public:
-  AppListController();
+  explicit AppListController(Shell* shell);
   virtual ~AppListController();
 
+  // Closes opened app list and cleans up its dependency on shell.
+  void Shutdown();
+
   // Show/hide app list window. The |window| is used to deterime in
   // which display (in which the |window| exists) the app list should
   // be shown.
@@ -54,6 +63,10 @@ class AppListController : public ui::EventHandler,
   // Whether app list window is visible (shown or being shown).
   bool IsVisible() const;
 
+  // Convenience wrapper to toggle visibility using the SetVisible() and
+  // IsVisible().
+  void Toggle(aura::Window* window);
+
   // Returns target visibility. This differs from IsVisible() if an animation
   // is ongoing.
   bool GetTargetVisibility() const { return is_visible_; }
@@ -61,6 +74,9 @@ class AppListController : public ui::EventHandler,
   // Returns app list window or NULL if it is not visible.
   aura::Window* GetWindow();
 
+  void AddObserver(AppListControllerObserver* observer);
+  void RemoveObserver(AppListControllerObserver* observer);
+
  private:
   // Sets the app list view and attempts to show it.
   void SetView(app_list::AppListView* view);
@@ -105,6 +121,8 @@ class AppListController : public ui::EventHandler,
   virtual void SelectedPageChanged(int old_selected, int new_selected) OVERRIDE;
   virtual void TransitionChanged() OVERRIDE;
 
+  Shell* shell_;
+
   scoped_ptr<app_list::PaginationModel> pagination_model_;
 
   // Whether we should show or hide app list widget.
@@ -119,6 +137,8 @@ class AppListController : public ui::EventHandler,
   // Whether should schedule snap back animation.
   bool should_snap_back_;
 
+  ObserverList<AppListControllerObserver, true> observers_;
+
   DISALLOW_COPY_AND_ASSIGN(AppListController);
 };