Tablet WM : Swiping on system tray bubble.

ash/system/tray/system_tray_bubble.h

Index: ash/system/tray/system_tray_bubble.h
diff --git a/ash/system/tray/system_tray_bubble.h b/ash/system/tray/system_tray_bubble.h
index 4e4c519ff22e55e8bbf2520705517a12f46fb184..8633202892505fc910ac57e1aa85bf662d1d1876 100644
--- a/ash/system/tray/system_tray_bubble.h
+++ b/ash/system/tray/system_tray_bubble.h
@@ -61,6 +61,10 @@ class SystemTrayBubble {
   // BUBBLE_TYPE_DEFAULT BubbleType.
   void RecordVisibleRowMetrics();
 
+  // Update the bounds of the system tray bubble. Close the bubble if
+  // |close_bubble| is set.
+  void UpdateBounds(const gfx::Rect& target_bounds, bool close_bubble);
+
  private:
   // Updates the bottom padding of the |bubble_view_| based on the
   // |bubble_type_|.
@@ -78,6 +82,10 @@ class SystemTrayBubble {
   int autoclose_delay_;
   base::OneShotTimer autoclose_;
 
+  // Used in maximize mode to make sure the system tray bubble only be shown in
+  // work area.
+  std::unique_ptr<aura::Window> clipping_window_;
+
   DISALLOW_COPY_AND_ASSIGN(SystemTrayBubble);
 };