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

chrome/browser/notifications/balloon_collection_gtk.cc

 // 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.
 
 #include "chrome/browser/notifications/balloon_collection_impl.h"
 
 #include "chrome/browser/notifications/balloon.h"
 #include "ui/gfx/size.h"
 
 #if defined(TOOLKIT_VIEWS)
@@ skipping 21 matching lines @@
 }
 
 int BalloonCollectionImpl::Layout::VerticalEdgeMargin() const {
   return 5;
 }
 
 void BalloonCollectionImpl::PositionBalloons(bool reposition) {
   PositionBalloonsInternal(reposition);
 }
 
+#if defined(TOUCH_UI)
+base::EventStatus BalloonCollectionImpl::WillProcessEvent(
+    const base::NativeEvent& event) {
+  return base::EVENT_CONTINUE;
+}
+
+void BalloonCollectionImpl::DidProcessEvent(const base::NativeEvent& event) {
+  NOTIMPLEMENTED();
+}
+#else
+void BalloonCollectionImpl::WillProcessEvent(GdkEvent* event) {
+}
+
 void BalloonCollectionImpl::DidProcessEvent(GdkEvent* event) {
   switch (event->type) {
     case GDK_MOTION_NOTIFY:
     case GDK_LEAVE_NOTIFY:
       HandleMouseMoveEvent();
       break;
     default:
       break;
   }
 }
+#endif
 
 bool BalloonCollectionImpl::IsCursorInBalloonCollection() const {
   GdkScreen* screen = gdk_screen_get_default();
   GdkDisplay* display = gdk_screen_get_display(screen);
   gint x, y;
   gdk_display_get_pointer(display, NULL, &x, &y, NULL);
   gfx::Point cursor(x, y);
 
   return GetBalloonsBoundingBox().Contains(cursor);
 }
@@ skipping 16 matching lines @@
   else
     NOTREACHED();
 
   PositionBalloons(true);
 }
 
 // static
 BalloonCollection* BalloonCollection::Create() {
   return new BalloonCollectionImpl();
 }