mash: Add WmShell::SetDisplayWorkAreaInsets for ShelfLayoutManager.

ash/shell.h

 // 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.
 
 #ifndef ASH_SHELL_H_
 #define ASH_SHELL_H_
 
 #include <memory>
 #include <utility>
 #include <vector>
@@ skipping 198 matching lines @@
   // Shows the context menu for the background and launcher at
   // |location_in_screen| (in screen coordinates).
   void ShowContextMenu(const gfx::Point& location_in_screen,
                        ui::MenuSourceType source_type);
 
   // Creates a default views::NonClientFrameView for use by windows in the
   // Ash environment.
   views::NonClientFrameView* CreateDefaultNonClientFrameView(
       views::Widget* widget);
 
-  // Sets the work area insets of the display that contains |window|,
-  // this notifies observers too.
-  // TODO(sky): this no longer really replicates what happens and is unreliable.
-  // Remove this.
+  // Sets work area insets of the display containing |window|, pings observers.
   void SetDisplayWorkAreaInsets(aura::Window* window,
                                 const gfx::Insets& insets);
 
   // Called when the user logs in.
   void OnLoginStateChanged(LoginStatus status);
 
   // Called after the logged-in user's profile is ready.
   void OnLoginUserProfilePrepared();
 
   // Called when the login status changes.
@@ skipping 389 matching lines @@
   base::SequencedWorkerPool* blocking_pool_;
 
   bool in_mus_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(Shell);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_H_