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

ui/aura/remote_root_window_host_win.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 "ui/aura/remote_root_window_host_win.h"
 
 #include <windows.h>
 
 #include <algorithm>
 
@@ skipping 202 matching lines @@
 bool RemoteWindowTreeHostWin::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(RemoteWindowTreeHostWin, message)
     IPC_MESSAGE_HANDLER(MetroViewerHostMsg_MouseMoved, OnMouseMoved)
     IPC_MESSAGE_HANDLER(MetroViewerHostMsg_MouseButton, OnMouseButton)
     IPC_MESSAGE_HANDLER(MetroViewerHostMsg_KeyDown, OnKeyDown)
     IPC_MESSAGE_HANDLER(MetroViewerHostMsg_KeyUp, OnKeyUp)
     IPC_MESSAGE_HANDLER(MetroViewerHostMsg_Character, OnChar)
     IPC_MESSAGE_HANDLER(MetroViewerHostMsg_WindowActivated,
                         OnWindowActivated)
+    IPC_MESSAGE_HANDLER(MetroViewerHostMsg_EdgeGesture, OnEdgeGesture)
     IPC_MESSAGE_HANDLER(MetroViewerHostMsg_TouchDown,
                         OnTouchDown)
     IPC_MESSAGE_HANDLER(MetroViewerHostMsg_TouchUp,
                         OnTouchUp)
     IPC_MESSAGE_HANDLER(MetroViewerHostMsg_TouchMoved,
                         OnTouchMoved)
     IPC_MESSAGE_HANDLER(MetroViewerHostMsg_FileSaveAsDone,
                         OnFileSaveAsDone)
     IPC_MESSAGE_HANDLER(MetroViewerHostMsg_FileOpenDone,
                         OnFileOpenDone)
@@ skipping 356 matching lines @@
                                      uint32 scan_code,
                                      uint32 flags) {
   DispatchKeyboardMessage(ui::ET_KEY_PRESSED, key_code, repeat_count,
                           scan_code, flags, true);
 }
 
 void RemoteWindowTreeHostWin::OnWindowActivated() {
   delegate_->OnHostActivated();
 }
 
+void RemoteWindowTreeHostWin::OnEdgeGesture() {
+  ui::GestureEvent event(
+      ui::ET_GESTURE_WIN8_EDGE_SWIPE,
+      0,
+      0,
+      0,
+      ui::EventTimeForNow(),
+      ui::GestureEventDetails(ui::ET_GESTURE_WIN8_EDGE_SWIPE, 0, 0),
+      0);
+  SendEventToProcessor(&event);
+}
+
 void RemoteWindowTreeHostWin::OnTouchDown(int32 x,
                                           int32 y,
                                           uint64 timestamp,
                                           uint32 pointer_id) {
   gfx::Point location = PointFromNativeEvent(x, y);
   ui::TouchEvent event(ui::ET_TOUCH_PRESSED,
                        location,
                        pointer_id,
                        base::TimeDelta::FromMicroseconds(timestamp));
   SendEventToProcessor(&event);
@@ skipping 149 matching lines @@
 }
 
 void RemoteWindowTreeHostWin::SetEventFlags(uint32 flags) {
   if (flags == event_flags_)
     return;
   event_flags_ = flags;
   SetVirtualKeyStates(event_flags_);
 }
 
 }  // namespace aura