Touch gestures for System Tray/ IME/ Stylus/ Notifications

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 04294179742e0a3b4ec99b50e2853a6decbd3f9d..0075f94d1fe6e031b7f60f2abb8b4c7646f8a78d 100644
--- a/ash/system/tray/tray_background_view.h
+++ b/ash/system/tray/tray_background_view.h
@@ -10,6 +10,7 @@
 #include "ash/ash_export.h"
 #include "ash/shelf/shelf_background_animator_observer.h"
 #include "ash/system/tray/actionable_view.h"
+#include "ash/system/tray_drag_controller.h"
 #include "base/macros.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/gfx/geometry/insets.h"
@@ -53,6 +54,15 @@ class ASH_EXPORT TrayBackgroundView : public ActionableView,
       const override;
   void PaintButtonContents(gfx::Canvas* canvas) override;
 
+  // Gets the associated tray bubble view.
+  virtual views::TrayBubbleView* GetBubbleView();
+
+  // Closes the associated tray bubble view if it is currently showing.
+  virtual void CloseBubble() {}
+
+  // Shows the associated tray bubble.
+  virtual void ShowBubble() {}
+
   // Called whenever the shelf alignment changes.
   virtual void UpdateAfterShelfAlignmentChange();
 
@@ -100,7 +110,11 @@ class ASH_EXPORT TrayBackgroundView : public ActionableView,
   gfx::Insets GetBubbleAnchorInsets() const;
 
   // Returns the container window for the bubble (on the proper display).
-  aura::Window* GetBubbleWindowContainer() const;
+  aura::Window* GetBubbleWindowContainer();
+
+  // Update the bounds of the associated tray bubble. Close the bubble if
+  // |close_bubble| is set.
+  void AnimateToTargetBounds(const gfx::Rect& target_bounds, bool close_bubble);
 
  protected:
   // ActionableView:
@@ -110,6 +124,8 @@ class ASH_EXPORT TrayBackgroundView : public ActionableView,
   void HandlePerformActionResult(bool action_performed,
                                  const ui::Event& event) override;
 
+  TrayDragController* drag_controller() { return drag_controller_.get(); }
+
  private:
   class TrayWidgetObserver;
 
@@ -145,6 +161,13 @@ class ASH_EXPORT TrayBackgroundView : public ActionableView,
   // right of tray.
   bool separator_visible_;
 
+  // Handles touch drag gestures on the tray area and its associated bubble.
+  std::unique_ptr<TrayDragController> drag_controller_;
+
+  // Used in maximize mode to make sure the system tray bubble only be shown in
+  // work area.
+  std::unique_ptr<aura::Window> clipping_window_;
+
   std::unique_ptr<TrayWidgetObserver> widget_observer_;
   std::unique_ptr<TrayEventFilter> tray_event_filter_;