Added text filtering to Overview Mode

ash/wm/overview/window_selector_item.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_ITEM_H_
 #define ASH_WM_OVERVIEW_WINDOW_SELECTOR_ITEM_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/rect.h"
@@ skipping 65 matching lines @@
   // label is read.
   void SendFocusAlert() const;
 
   const gfx::Rect& bounds() const { return bounds_; }
   const gfx::Rect& target_bounds() const { return target_bounds_; }
 
   // views::ButtonListener:
   virtual void ButtonPressed(views::Button* sender,
                              const ui::Event& event) OVERRIDE;
 
+  // Sets if the item is dimmed in the overview. Changing the value will also
+  // change the visibility of the transform windows.
+  void SetDimmed(bool dimmed);
+  bool dimmed() const { return dimmed_; }
+
  protected:
   // Sets the bounds of this selector's items to |target_bounds| in
   // |root_window|. If |animate| the windows are animated from their current
   // location.
   virtual void SetItemBounds(aura::Window* root_window,
                              const gfx::Rect& target_bounds,
                              bool animate) = 0;
 
+  // Changes the visibility of the item.
+  virtual void ChangeItemVisibility(bool visible) = 0;

[flackr, 2014/06/26 17:33:08]

nit: Items aren't becoming invisible, just not full opacity:
s/Visibility/Opacity.

Instead of bool, can we pass float opacity?

[Nina, 2014/06/27 15:20:39]

Done.

+
   // Sets the bounds used by the selector item's windows.
   void set_bounds(const gfx::Rect& bounds) { bounds_ = bounds; }
 
+  // True if the item is being shown in the overview, false if it's being
+  // filtered.
+  bool dimmed_;
+
  private:
   friend class WindowSelectorTest;
 
   // Creates |close_button_| if it does not exist and updates the bounds based
   // on GetCloseButtonTargetBounds()
   void UpdateCloseButtonBounds(aura::Window* root_window, bool animate);
 
   // Creates a label to display under the window selector item.
   void UpdateWindowLabels(const gfx::Rect& target_bounds,
                           aura::Window* root_window,
@@ skipping 23 matching lines @@
   // Transparent window on top of the real windows in the overview that
   // activates them on click or tap.
   scoped_ptr<TransparentActivateWindowButton> activate_window_button_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowSelectorItem);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_OVERVIEW_WINDOW_SELECTOR_ITEM_H_