Copy contents of ui/base/ios into ios/chrome/browser/ui/context_menu

ios/web/web_state/ui/crw_context_menu_provider.h

 // Copyright 2011 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 IOS_WEB_WEB_STATE_UI_CRW_CONTEXT_MENU_PROVIDER_H_
 #define IOS_WEB_WEB_STATE_UI_CRW_CONTEXT_MENU_PROVIDER_H_
 
 #import <Foundation/Foundation.h>
 
 @class CRUContextMenuHolder;
+@class ContextMenuHolder;
 
 // A protocol implemented by a provider of labels and actions for a context
 // menu.
 @protocol CRWContextMenuProvider<NSObject>
 
+// Temporarily optional to allow move of ContextMenuHolder.
+@optional
 // Returns a CRUContextMenuHolder with the titles and actions associated with
 // each menu item. The "Cancel" item is automatically added when constructing
 // the menu for presentation, therefore it should not be added to the list.
 // Each CRWContextMenuProvider might have different requirements for the
 // |contextDictionary|. On a web page |kContextLinkURLString| and
 // |kContextImageURLString| might both be set whereas on a recently visited
 // entry some other identifier will be passed on.
 - (CRUContextMenuHolder*)contextMenuForDictionary:(NSDictionary*)context;
+- (ContextMenuHolder*)contextMenuHolderForDictionary:(NSDictionary*)context;
 
 @end
 
 namespace web {
 
 // Keys for the contextDictionary.
 
 // The menu title (as an NSString).
 extern NSString* const kContextTitle;
 // The url spec (as an NSString) of the the inner-most wrapping anchor tag to
 // the current element.
 extern NSString* const kContextLinkURLString;
 // The referrer policy to use when opening the link.
 extern NSString* const kContextLinkReferrerPolicy;
 // The url spec (as an NSString) for the image of the current element.
 extern NSString* const kContextImageURLString;
 
 }  // namespace web
 
 #endif  // IOS_WEB_WEB_STATE_UI_CRW_CONTEXT_MENU_PROVIDER_H_