Allow Alt-Tab to move the focus to docked windows.

ash/wm/overview/window_selector.h

 // Copyright 2013 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_WM_OVERVIEW_WINDOW_SELECTOR_H_
 #define ASH_WM_OVERVIEW_WINDOW_SELECTOR_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 38 matching lines @@
 class ASH_EXPORT WindowSelector
     : public gfx::DisplayObserver,
       public aura::WindowObserver,
       public aura::client::ActivationChangeObserver,
       public views::TextfieldController {
  public:
   // The distance between the top edge of the screen and the bottom edge of
   // the text filtering textfield.
   static const int kTextFilterBottomEdge;
 
+  // Returns true if the window can be selected in overview mode.
+  static bool IsSelectable(aura::Window* window);
+
   enum Direction {
     LEFT,
     UP,
     RIGHT,
     DOWN
   };
 
   typedef std::vector<aura::Window*> WindowList;
   typedef ScopedVector<WindowSelectorItem> WindowSelectorItemList;
 
@@ skipping 116 matching lines @@
   // Tracks whether minimized windows are currently being restored for overview
   // mode.
   bool restoring_minimized_windows_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowSelector);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_OVERVIEW_WINDOW_SELECTOR_H_