Added text filtering to Overview Mode

ash/wm/overview/window_selector_item.h

Index: ash/wm/overview/window_selector_item.h
diff --git a/ash/wm/overview/window_selector_item.h b/ash/wm/overview/window_selector_item.h
index ac57266c12266fba0482d92dc692c8e82dbdb17a..d76912ea0ca7f9bc32608d103b4f808056f10113 100644
--- a/ash/wm/overview/window_selector_item.h
+++ b/ash/wm/overview/window_selector_item.h
@@ -83,6 +83,11 @@ class WindowSelectorItem : public 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
@@ -91,9 +96,16 @@ class WindowSelectorItem : public views::ButtonListener {
                              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;