aura: Gesture event plumbing (skeleton).

ash/wm/root_window_event_filter.h

Index: ash/wm/root_window_event_filter.h
diff --git a/ash/wm/root_window_event_filter.h b/ash/wm/root_window_event_filter.h
index 56b2d85110f3e047fe422dc6d8c849b76ac6adb3..0eb552c1a14980a2f1af8752cafc94762cbeee9b 100644
--- a/ash/wm/root_window_event_filter.h
+++ b/ash/wm/root_window_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.
 
@@ -40,6 +40,9 @@ class ASH_EXPORT RootWindowEventFilter : public aura::EventFilter {
                                    aura::MouseEvent* event) OVERRIDE;
   virtual ui::TouchStatus PreHandleTouchEvent(aura::Window* target,
                                               aura::TouchEvent* event) OVERRIDE;
+  virtual ui::GestureStatus PreHandleGestureEvent(
+      aura::Window* target,
+      aura::GestureEvent* event) OVERRIDE;
 
  private:
   // Updates the cursor if the target provides a custom one, and provides