Add deprecation warning banner to App Launcher on Mac.

ui/app_list/cocoa/app_list_view_controller.h

 // 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.
 
 #ifndef UI_APP_LIST_COCOA_APP_LIST_VIEW_CONTROLLER_H_
 #define UI_APP_LIST_COCOA_APP_LIST_VIEW_CONTROLLER_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/scoped_nsobject.h"
@@ skipping 11 matching lines @@
 
 @class AppListPagerView;
 @class AppsGridController;
 
 // Controller for the top-level view of the app list UI. It creates and hosts an
 // AppsGridController (displaying an AppListModel), pager control to navigate
 // between pages in the grid, and search entry box with a pop up menu.
 APP_LIST_EXPORT
 @interface AppListViewController : NSViewController<AppsPaginationModelObserver,
                                                     AppsSearchBoxDelegate,
-                                                    AppsSearchResultsDelegate> {
+                                                    AppsSearchResultsDelegate,
+                                                    NSTextViewDelegate> {
  @private
   base::scoped_nsobject<AppsGridController> appsGridController_;
   base::scoped_nsobject<AppListPagerView> pagerControl_;
   base::scoped_nsobject<AppsSearchBoxController> appsSearchBoxController_;
   base::scoped_nsobject<AppsSearchResultsController>
       appsSearchResultsController_;
 
+  // If set, a message displayed above the app list grid.
+  base::scoped_nsobject<NSTextView> messageText_;
+  base::scoped_nsobject<NSScrollView> messageScrollView_;
+
   // Subview for drawing the background.
   base::scoped_nsobject<NSView> backgroundView_;
 
   // Subview of |backgroundView_| that slides out when search results are shown.
   base::scoped_nsobject<NSView> contentsView_;
 
   // Progress indicator that is visible while the delegate is NULL.
   base::scoped_nsobject<NSProgressIndicator> loadingIndicator_;
 
   app_list::AppListViewDelegate* delegate_;  // Weak. Owned by AppListService.
@@ skipping 16 matching lines @@
 
 @property(nonatomic, readonly) BOOL showingSearchResults;
 
 - (AppsGridController*)appsGridController;
 - (NSSegmentedControl*)pagerControl;
 - (NSView*)backgroundView;
 
 @end
 
 #endif  // UI_APP_LIST_COCOA_APP_LIST_VIEW_CONTROLLER_H_