Use active state on touch start for tray icons

ash/system/tray/tray_background_view.h

Index: ash/system/tray/tray_background_view.h
diff --git a/ash/system/tray/tray_background_view.h b/ash/system/tray/tray_background_view.h
index da4eaf547ce28d0d34e9b4df2c69263aab9cf3bb..8b3deae63c0f3ae1b08ef6018851aaafabd414a5 100644
--- a/ash/system/tray/tray_background_view.h
+++ b/ash/system/tray/tray_background_view.h
@@ -77,6 +77,7 @@ class ASH_EXPORT TrayBackgroundView : public ActionableView,
   // ActionableView:
   virtual bool PerformAction(const ui::Event& event) OVERRIDE;
   virtual gfx::Rect GetFocusBounds() OVERRIDE;
+  virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
 
   // BackgroundAnimatorDelegate:
   virtual void UpdateBackground(int alpha) OVERRIDE;
@@ -185,6 +186,10 @@ class ASH_EXPORT TrayBackgroundView : public ActionableView,
   // differently if set to true.
   bool draw_background_as_active_;
 
+  // True if touch view feedback command line flag has been enabled. When
+  // enabled touch gestures will toggle rendering the background as active.
+  bool touch_feedback_enabled_;
+
   scoped_ptr<TrayWidgetObserver> widget_observer_;
   scoped_ptr<TrayEventFilter> tray_event_filter_;