Fully support the autohide shelf option for touch UI on Windows.

ui/events/event.h

 // 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.
 
 #ifndef UI_EVENTS_EVENT_H_
 #define UI_EVENTS_EVENT_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/event_types.h"
@@ skipping 107 matching lines @@
       case ET_GESTURE_BEGIN:
       case ET_GESTURE_END:
       case ET_GESTURE_TWO_FINGER_TAP:
       case ET_GESTURE_PINCH_BEGIN:
       case ET_GESTURE_PINCH_END:
       case ET_GESTURE_PINCH_UPDATE:
       case ET_GESTURE_LONG_PRESS:
       case ET_GESTURE_LONG_TAP:
       case ET_GESTURE_MULTIFINGER_SWIPE:
       case ET_GESTURE_SHOW_PRESS:
+      case ET_GESTURE_WIN8_EDGE_SWIPE:
         // When adding a gesture event which is paired with an event which
         // occurs earlier, add the event to |IsEndingEvent|.
         return true;
 
       case ET_SCROLL_FLING_CANCEL:
       case ET_SCROLL_FLING_START:
         // These can be ScrollEvents too. EF_FROM_TOUCH determines if they're
         // Gesture or Scroll events.
         return (flags_ & EF_FROM_TOUCH) == EF_FROM_TOUCH;
 
@@ skipping 554 matching lines @@
   // The set of indices of ones in the binary representation of
   // touch_ids_bitfield_ is the set of touch_ids associate with this gesture.
   // This value is stored as a bitfield because the number of touch ids varies,
   // but we currently don't need more than 32 touches at a time.
   const unsigned int touch_ids_bitfield_;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_EVENT_H_