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..04b4301cd792bd96a00fcdfc224a4b8d37f70e3d 100644
--- a/ash/system/tray/system_tray.h
+++ b/ash/system/tray/system_tray.h
@@ -152,6 +152,12 @@ 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. Note, the events may be
+  // triggered on system tray or system tray bubble.
+  bool ProcessGestureEvent(const ui::GestureEvent& event, bool is_on_bubble);
+
   gfx::Rect GetWorkAreaBoundsInScreen() const;
 
  private:
@@ -202,14 +208,13 @@ 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);
 
-  // Update the bounds of the system tray bubble according to |location|. Note
-  // that |location| is in the local coordinate space of |this|.
-  void SetBubbleBounds(const gfx::Point& location);
+  // Update the bounds of the system tray bubble according to
+  // |gesture_drag_amount_|.
+  void UpdateBubbleBounds();
 
   // Return true if the system bubble should be shown (i.e., animated upward to
   // be made fully visible) after a sequence of scroll events terminated by
@@ -232,6 +237,10 @@ class ASH_EXPORT SystemTray : public TrayBackgroundView,
   // tray bubble, false otherwise.
   bool is_in_drag_ = false;
 
+  // True if the dragging is on system tray bubble, false otherwise. Note,
+  // should always set this before ProcessGestureEvent.
+  bool is_on_bubble_ = false;
+
   // The web notification tray view that appears adjacent to this view.
   WebNotificationTray* web_notification_tray_ = nullptr;