Enable ash window cycle UI by default.

ash/common/wm/window_cycle_list.h

 // Copyright 2014 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 ASH_COMMON_WM_WINDOW_CYCLE_LIST_H_
 #define ASH_COMMON_WM_WINDOW_CYCLE_LIST_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 24 matching lines @@
 
   bool empty() const { return windows_.empty(); }
 
   // Cycles to the next or previous window based on |direction|.
   void Step(WindowCycleController::Direction direction);
 
   int current_index() const { return current_index_; }
 
  private:
   friend class WindowCycleControllerTest;
+
+  static void DisableInitialDelayForTesting();
+
   const WindowList& windows() const { return windows_; }
 
   // WmWindowObserver overrides:
   // There is a chance a window is destroyed, for example by JS code. We need to
   // take care of that even if it is not intended for the user to close a window
   // while window cycling.
   void OnWindowDestroying(WmWindow* window) override;
 
   // Returns true if the window list overlay should be shown.
   bool ShouldShowUi();
 
   // Initializes and shows |cycle_view_|.
   void InitWindowCycleView();
 
   // List of weak pointers to windows to use while cycling with the keyboard.
   // List is built when the user initiates the gesture (i.e. hits alt-tab the
   // first time) and is emptied when the gesture is complete (i.e. releases the
   // alt key).
   WindowList windows_;
 
   // Current position in the |windows_|. Can be used to query selection depth,
   // i.e., the position of an active window in a global MRU ordering.
   int current_index_;
 
   // Wrapper for the window brought to the front.
+  // TODO(estade): remove ScopedShowWindow when we know we are happy launching
+  // the |cycle_view_| version.
   std::unique_ptr<ScopedShowWindow> showing_window_;
 
   // The top level View for the window cycle UI. May be null if the UI is not
   // showing.
   WindowCycleView* cycle_view_;
 
   // The widget that hosts the window cycle UI.
   std::unique_ptr<views::Widget> cycle_ui_widget_;
 
   // A timer to delay showing the UI. Quick Alt+Tab should not flash a UI.
   base::OneShotTimer show_ui_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowCycleList);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_WINDOW_CYCLE_LIST_H_