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

win8/metro_driver/chrome_app_view_ash.cc

Index: win8/metro_driver/chrome_app_view_ash.cc
diff --git a/win8/metro_driver/chrome_app_view_ash.cc b/win8/metro_driver/chrome_app_view_ash.cc
index b8f2241483c8387ffad29ab01cf24d9e24ca2ddb..9b7e6b67cad845e2f49114a04ddcd6962e0fa9e2 100644
--- a/win8/metro_driver/chrome_app_view_ash.cc
+++ b/win8/metro_driver/chrome_app_view_ash.cc
@@ -1288,11 +1288,7 @@ HRESULT ChromeAppViewAsh::HandleProtocolRequest(
 HRESULT ChromeAppViewAsh::OnEdgeGestureCompleted(
     winui::Input::IEdgeGesture* gesture,
     winui::Input::IEdgeGestureEventArgs* args) {
-  // Swipe from edge gesture (and win+z) is equivalent to pressing F11.
-  // TODO(cpu): Make this cleaner for m33.
-  ui_channel_->Send(new MetroViewerHostMsg_KeyDown(VK_F11, 1, 0, 0));
-  ::Sleep(15);
-  ui_channel_->Send(new MetroViewerHostMsg_KeyUp(VK_F11, 1, 0, 0));
+  ui_channel_->Send(new MetroViewerHostMsg_EdgeGesture());
   return S_OK;
 }