aura: Gesture event plumbing (skeleton).

ash/wm/modality_event_filter.h

Index: ash/wm/modality_event_filter.h
diff --git a/ash/wm/modality_event_filter.h b/ash/wm/modality_event_filter.h
index 0005f382dd321cd489b26a797dfd80d1b6318b6f..5063525000ecc81531694a126c9b3ee5a7ed535f 100644
--- a/ash/wm/modality_event_filter.h
+++ b/ash/wm/modality_event_filter.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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.
 
@@ -29,6 +29,9 @@ class ASH_EXPORT ModalityEventFilter : public aura::EventFilter {
   virtual ui::TouchStatus PreHandleTouchEvent(
       aura::Window* target,
       aura::TouchEvent* event) OVERRIDE;
+  virtual ui::GestureStatus PreHandleGestureEvent(
+      aura::Window* target,
+      aura::GestureEvent* event) OVERRIDE;
 
  private:
   ModalityEventFilterDelegate* delegate_;