mash: Preliminary support for shelf auto-hide

ash/shelf/shelf_tooltip_manager.cc

 // Copyright 2013 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/shelf/shelf_tooltip_manager.h"
 
 #include "ash/shelf/shelf.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shelf/shelf_view.h"
 #include "ash/shell.h"
@@ skipping 221 matching lines @@
   shelf_layout_manager_ = nullptr;
   shelf_view_ = nullptr;
 }
 
 void ShelfTooltipManager::WillChangeVisibilityState(
     ShelfVisibilityState new_state) {
   if (new_state == SHELF_HIDDEN)
     Close();
 }
 
-void ShelfTooltipManager::OnAutoHideStateChanged(ShelfAutoHideState new_state) {
+void ShelfTooltipManager::OnAutoHideStateChanged(
+    ShelfLayoutManager* layout_manager,
+    ShelfAutoHideState new_state) {
   if (new_state == SHELF_AUTO_HIDE_HIDDEN) {
     timer_.Stop();
     // AutoHide state change happens during an event filter, so immediate close
     // may cause a crash in the HandleMouseEvent() after the filter.  So we just
     // schedule the Close here.
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE,
         base::Bind(&ShelfTooltipManager::Close, weak_factory_.GetWeakPtr()));
   }
 }
 
 }  // namespace ash