Refactor LauncherItemController and LauncherItemDelegate

ash/launcher/launcher_delegate.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_LAUNCHER_LAUNCHER_DELEGATE_H_
 #define ASH_LAUNCHER_LAUNCHER_DELEGATE_H_
 
 #include "ash/ash_export.h"
 #include "ash/launcher/launcher_types.h"
 
 namespace aura {
 class Window;
 }
 
 namespace ash {
 class Launcher;
 
 // Delegate for the Launcher.
 class ASH_EXPORT LauncherDelegate {
  public:
   // Launcher owns the delegate.
   virtual ~LauncherDelegate() {}
 
   // Returns the id of the item associated with the specified window, or 0 if
   // there isn't one.
   // Note: Windows of tabbed browsers will return the |LauncherID| of the
   // currently active tab or selected tab.
+  // TODO(simon.hong81): Remove this and handle in LauncherItemDelegateManager.
   virtual LauncherID GetIDByWindow(aura::Window* window) = 0;
 
   // Callback used to allow delegate to perform initialization actions that
   // depend on the Launcher being in a known state.
   virtual void OnLauncherCreated(Launcher* launcher) = 0;
 
   // Callback used to inform the delegate that a specific launcher no longer
   // exists.
   virtual void OnLauncherDestroyed(Launcher* launcher) = 0;
 
@@ skipping 15 matching lines @@
   // disallowed by policy in case there is a pre-defined set of pinned apps.
   virtual bool CanPin() const = 0;
 
   // Unpins app item with |app_id|.
   virtual void UnpinAppWithID(const std::string& app_id) = 0;
 };
 
 }  // namespace ash
 
 #endif  // ASH_LAUNCHER_LAUNCHER_DELEGATE_H_