Makes the maximize/restore button handling

ash/launcher/launcher_button.h

Index: ash/launcher/launcher_button.h
diff --git a/ash/launcher/launcher_button.h b/ash/launcher/launcher_button.h
index a3d1310205555128cb31b86d287a9e31a6459a70..6ffbd1d8cd0d7614cbcb6b1ea66ffa04161652b6 100644
--- a/ash/launcher/launcher_button.h
+++ b/ash/launcher/launcher_button.h
@@ -39,6 +39,9 @@ class LauncherButton : public views::CustomButton {
   void ClearState(State state);
   int state() const { return state_; }
 
+  // Returns the bounds of the icon.
+  gfx::Rect GetIconBounds() const;
+
  protected:
   LauncherButton(views::ButtonListener* listener, LauncherButtonHost* host);