Consolidate message observer API for win and aura (and touch).

chrome/browser/notifications/balloon_collection_impl.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Handles the visible notification (or balloons).
 
 #ifndef CHROME_BROWSER_NOTIFICATIONS_BALLOON_COLLECTION_IMPL_H_
 #define CHROME_BROWSER_NOTIFICATIONS_BALLOON_COLLECTION_IMPL_H_
 #pragma once
 
@@ skipping 35 matching lines @@
   virtual bool RemoveBySourceOrigin(const GURL& source_origin);
   virtual void RemoveAll();
   virtual bool HasSpace() const;
   virtual void ResizeBalloon(Balloon* balloon, const gfx::Size& size);
   virtual void SetPositionPreference(PositionPreference position);
   virtual void DisplayChanged();
   virtual void OnBalloonClosed(Balloon* source);
   virtual const Balloons& GetActiveBalloons();
 
   // MessageLoopForUI::Observer interface.
-#if defined(OS_WIN)
-  virtual void WillProcessMessage(const MSG& event) {}
-  virtual void DidProcessMessage(const MSG& event);
-#endif
-#if defined(TOOLKIT_USES_GTK)
-  virtual void WillProcessEvent(GdkEvent* event) {}
-  virtual void DidProcessEvent(GdkEvent* event);
+#if defined(OS_WIN) || defined(TOUCH_UI) || defined(USE_AURA)
+  virtual base::EventStatus WillProcessEvent(
+      const base::NativeEvent& event) OVERRIDE;
+  virtual void DidProcessEvent(const base::NativeEvent& event) OVERRIDE;
+#elif defined(TOOLKIT_USES_GTK)
+  virtual void WillProcessEvent(GdkEvent* event) OVERRIDE;
+  virtual void DidProcessEvent(GdkEvent* event) OVERRIDE;
 #endif
 
  protected:
   // Calculates layout values for the balloons including
   // the scaling, the max/min sizes, and the upper left corner of each.
   class Layout {
    public:
     Layout();
 
     // These enumerations all are based on a screen orientation where
@@ skipping 114 matching lines @@
   ScopedRunnableMethodFactory<BalloonCollectionImpl> reposition_factory_;
 
   // Is the balloon collection currently listening for UI events?
   bool added_as_message_loop_observer_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(BalloonCollectionImpl);
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_BALLOON_COLLECTION_IMPL_H_