Touch gestures for System Tray/ IME/ Stylus/ Notifications

ash/system/tray/system_tray.h

Index: ash/system/tray/system_tray.h
diff --git a/ash/system/tray/system_tray.h b/ash/system/tray/system_tray.h
index fe8a0fdd31ce963155313cde514041c6370d8e13..86ea0ea368b5cacd206aab2100c24d4dd866d00d 100644
--- a/ash/system/tray/system_tray.h
+++ b/ash/system/tray/system_tray.h
@@ -152,8 +152,15 @@ class ASH_EXPORT SystemTray : public TrayBackgroundView,
   // ui::EventHandler:
   void OnGestureEvent(ui::GestureEvent* event) override;
 
+  // Process a gesture event and updates the dragging state of the bubble when
+  // appropriate. Returns true if the gesture has been handled and it should not
+  // be processed any further, false otherwise.
+  bool ProcessGestureEvent(const ui::GestureEvent& event);
+
   gfx::Rect GetWorkAreaBoundsInScreen() const;
 
+  void set_target_view(View* target_view) { target_view_ = target_view; }
+
  private:
   friend class SystemTrayTestApi;
   class ActivationObserver;
@@ -202,7 +209,6 @@ class ASH_EXPORT SystemTray : public TrayBackgroundView,
   bool PerformAction(const ui::Event& event) override;
 
   // Gesture related functions:
-  bool ProcessGestureEvent(const ui::GestureEvent& event);
   bool StartGestureDrag(const ui::GestureEvent& gesture);
   void UpdateGestureDrag(const ui::GestureEvent& gesture);
   void CompleteGestureDrag(const ui::GestureEvent& gesture);
@@ -232,6 +238,10 @@ class ASH_EXPORT SystemTray : public TrayBackgroundView,
   // tray bubble, false otherwise.
   bool is_in_drag_ = false;
 
+  // The view that the dragging triggered on (i.e, dragging can starts from
+  // system tray or system tray bubble).
+  View* target_view_;
+
   // The web notification tray view that appears adjacent to this view.
   WebNotificationTray* web_notification_tray_ = nullptr;