Enable mash shelf tooltips.

ash/test/shelf_view_test_api.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/test/shelf_view_test_api.h"
 
 #include "ash/shelf/overflow_button.h"
 #include "ash/shelf/shelf_button.h"
 #include "ash/shelf/shelf_constants.h"
 #include "ash/shelf/shelf_model.h"
@@ skipping 83 matching lines @@
   // OnBoundsAnimatorDone is called.
   base::MessageLoop::current()->Run();
 
   shelf_view_->bounds_animator_->RemoveObserver(observer.get());
 }
 
 OverflowBubble* ShelfViewTestAPI::overflow_bubble() {
   return shelf_view_->overflow_bubble_.get();
 }
 
+ShelfTooltipManager* ShelfViewTestAPI::tooltip_manager() {
+  return &shelf_view_->tooltip_;
+}
+
 gfx::Size ShelfViewTestAPI::GetPreferredSize() {
   return shelf_view_->GetPreferredSize();
 }
 
 int ShelfViewTestAPI::GetButtonSize() {
   return kShelfButtonSize;
 }
 
 int ShelfViewTestAPI::GetButtonSpacing() {
   return kShelfButtonSpacing;
@@ skipping 25 matching lines @@
     return shelf_view_->dragged_off_from_overflow_to_shelf_;
 }
 
 ShelfButtonPressedMetricTracker*
 ShelfViewTestAPI::shelf_button_pressed_metric_tracker() {
   return &(shelf_view_->shelf_button_pressed_metric_tracker_);
 }
 
 }  // namespace test
 }  // namespace ash