Do not show the mouse cursor when the display is rotated in TouchView

ui/aura/window_event_dispatcher.cc

 // Copyright 2014 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/window_event_dispatcher.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 190 matching lines @@
 }
 
 void WindowEventDispatcher::OnHostLostMouseGrab() {
   mouse_pressed_handler_ = NULL;
   mouse_moved_handler_ = NULL;
 }
 
 void WindowEventDispatcher::OnCursorMovedToRootLocation(
     const gfx::Point& root_location) {
   SetLastMouseLocation(window(), root_location);
-  synthesize_mouse_move_ = false;
+
+  // Synthesize a mouse move in case the cursor's location in root coordinates
+  // changed but its position in WindowTreeHost coordinates did not.
+  PostSynthesizeMouseMove();
 }
 
 void WindowEventDispatcher::OnPostNotifiedWindowDestroying(Window* window) {
   OnWindowHidden(window, WINDOW_DESTROYED);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // WindowEventDispatcher, private:
 
 Window* WindowEventDispatcher::window() {
@@ skipping 666 matching lines @@
   }
 
   // This flag is set depending on the gestures recognized in the call above,
   // and needs to propagate with the forwarded event.
   event->set_may_cause_scrolling(orig_event.may_cause_scrolling());
 
   PreDispatchLocatedEvent(target, event);
 }
 
 }  // namespace aura