Revert of mash: Remove ChromeLauncherController's |id_to_item_controller_map_|.

chrome/browser/ui/ash/launcher/chrome_launcher_controller_mus.cc

 // Copyright 2016 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 "chrome/browser/ui/ash/launcher/chrome_launcher_controller_mus.h"
 
 #include "ash/public/cpp/app_launch_id.h"
 #include "base/strings/string_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
@@ skipping 25 matching lines @@
 void ChromeLauncherControllerMus::SetItemType(ash::ShelfID id,
                                               ash::ShelfItemType type) {
   NOTIMPLEMENTED();
 }
 
 void ChromeLauncherControllerMus::SetItemStatus(ash::ShelfID id,
                                                 ash::ShelfItemStatus status) {
   NOTIMPLEMENTED();
 }
 
+void ChromeLauncherControllerMus::SetShelfItemDelegate(
+    ash::ShelfID id,
+    std::unique_ptr<ash::ShelfItemDelegate> item_delegate) {
+  NOTIMPLEMENTED();
+}
+
 void ChromeLauncherControllerMus::CloseLauncherItem(ash::ShelfID id) {
   NOTIMPLEMENTED();
 }
 
 bool ChromeLauncherControllerMus::IsPinned(ash::ShelfID id) {
   NOTIMPLEMENTED();
   return false;
 }
 
 void ChromeLauncherControllerMus::SetV1AppStatus(const std::string& app_id,
@@ skipping 105 matching lines @@
     content::WebContents* web_contents) const {
   NOTIMPLEMENTED();
   return base::string16();
 }
 
 BrowserShortcutLauncherItemController*
 ChromeLauncherControllerMus::GetBrowserShortcutLauncherItemController() {
   NOTIMPLEMENTED();
   return nullptr;
 }
+
+ash::ShelfItemDelegate* ChromeLauncherControllerMus::GetShelfItemDelegate(
+    const ash::ShelfID id) {
+  NOTIMPLEMENTED();
+  return nullptr;
+}
 
 bool ChromeLauncherControllerMus::ShelfBoundsChangesProbablyWithUser(
     ash::WmShelf* shelf,
     const AccountId& account_id) const {
   NOTIMPLEMENTED();
   return false;
 }
 
 void ChromeLauncherControllerMus::OnUserProfileReadyToSwitch(Profile* profile) {
   NOTIMPLEMENTED();
@@ skipping 41 matching lines @@
     item->image = *image.ToSkBitmap();
     // TOOD(msw): Actually pin the item and install its delegate; this code is
     // unused at the moment. See http://crbug.com/647879
     AppIconLoader* app_icon_loader = GetAppIconLoaderForApp(app_id);
     if (app_icon_loader) {
       app_icon_loader->FetchImage(app_id);
       app_icon_loader->UpdateImage(app_id);
     }
   }
 }