Enable immersive fullscreen on Windows Ash.

ash/wm/system_gesture_event_filter.cc

 // 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.
 
 #include "ash/wm/system_gesture_event_filter.h"
 
 #include "ash/ash_switches.h"
 #include "ash/metrics/user_metrics_recorder.h"
 #include "ash/shell.h"
 #include "ash/touch/touch_uma.h"
@@ skipping 47 matching lines @@
   long_press_affordance_->ProcessEvent(target, event);
 
   if (overview_gesture_handler_ &&
       overview_gesture_handler_->ProcessGestureEvent(*event)) {
     event->StopPropagation();
     return;
   }
 
   if (event->type() == ui::ET_GESTURE_WIN8_EDGE_SWIPE &&
       shelf_gesture_handler_->ProcessGestureEvent(*event)) {
-    event->StopPropagation();
+    // Do not stop propagation, since the immersive fullscreen controller may
+    // need to handle this event.
+    return;

[pkotwicz, 2014/03/13 18:34:32]

Nits: - Return is unncessary given that this is the end of the function?
      - "the immersive fullscreen controller" -> ImmersiveFullscreenController

[zturner, 2014/03/13 19:28:10]

I put return here so that it is clear this should be an early out, so that
anyone modifying the function later will simply need to add to the end and
reduce the risk of introducing a bug.

   }
 }
 
 }  // namespace internal
 }  // namespace ash