aura: Do not show tooltips if mouse cursor is hidden.

ash/tooltips/tooltip_controller.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 "ash/tooltips/tooltip_controller.h"
 
 #include <vector>
 
 #include "ash/ash_switches.h"
 #include "ash/shell.h"
@@ skipping 354 matching lines @@
     }
   }
   *text = result;
 }
 
 void TooltipController::TooltipTimerFired() {
   UpdateIfRequired();
 }
 
 void TooltipController::UpdateIfRequired() {
-  if (!tooltips_enabled_ || mouse_pressed_ || IsDragDropInProgress()) {
+  if (!tooltips_enabled_ || mouse_pressed_ || IsDragDropInProgress() ||
+      !Shell::GetRootWindow()->cursor_shown()) {
     tooltip_->Hide();
     return;
   }
 
   string16 tooltip_text;
   if (tooltip_window_)
     tooltip_text = aura::client::GetTooltipText(tooltip_window_);
 
   // If the user pressed a mouse button. We will hide the tooltip and not show
   // it until there is a change in the tooltip.
@@ skipping 32 matching lines @@
 bool TooltipController::IsDragDropInProgress() {
   aura::client::DragDropClient* client = aura::client::GetDragDropClient(
       Shell::GetRootWindow());
   if (client)
     return client->IsDragDropInProgress();
   return false;
 }
 
 }  // namespace internal
 }  // namespace ash