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

ui/aura/test/event_generator.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/test/event_generator.h"
 
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "ui/aura/client/screen_position_client.h"
@@ skipping 230 matching lines @@
 void EventGenerator::PressMoveAndReleaseTouchTo(const gfx::Point& point) {
   PressTouch();
   MoveTouch(point);
   ReleaseTouch();
 }
 
 void EventGenerator::PressMoveAndReleaseTouchToCenterOf(Window* window) {
   PressMoveAndReleaseTouchTo(CenterOfWindow(window));
 }
 
+#if defined(OS_WIN)
+void EventGenerator::GestureEdgeSwipe() {
+  ui::GestureEvent gesture(
+      ui::ET_GESTURE_WIN8_EDGE_SWIPE,
+      0,
+      0,
+      0,
+      ui::EventTimeForNow(),
+      ui::GestureEventDetails(ui::ET_GESTURE_WIN8_EDGE_SWIPE, 0, 0),
+      0);
+  Dispatch(&gesture);
+}
+#endif
+
 void EventGenerator::GestureTapAt(const gfx::Point& location) {
   const int kTouchId = 2;
   ui::TouchEvent press(ui::ET_TOUCH_PRESSED,
                        location,
                        kTouchId,
                        ui::EventTimeForNow());
   Dispatch(&press);
 
   ui::TouchEvent release(
       ui::ET_TOUCH_RELEASED, location, kTouchId,
@@ skipping 350 matching lines @@
     base::MessageLoopProxy::current()->PostTask(
         FROM_HERE,
         base::Bind(&EventGenerator::DispatchNextPendingEvent,
                    base::Unretained(this)));
   }
 }
 
 
 }  // namespace test
 }  // namespace aura