Annotates functions returning retained objects.

ios/web/web_state/web_view_internal_creation_util.h

 // Copyright 2014 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_WEB_VIEW_INTERNAL_CREATION_UTIL_H_
 #define IOS_WEB_WEB_STATE_WEB_VIEW_INTERNAL_CREATION_UTIL_H_
 
 #import <CoreGraphics/CoreGraphics.h>
 #import <WebKit/WebKit.h>
 
 // This file is a collection of functions that vend web views.
 namespace web {
 class BrowserState;
 
 // Creates a new WKWebView for displaying regular web content and registers a
 // user agent for it.
 //
 // Preconditions for creation of a WKWebView:
 // 1) |browser_state|, |configuration| are not null.
 // 2) web::BrowsingDataPartition is synchronized.
 // 3) The WKProcessPool of the configuration is the same as the WKProcessPool
 //    of the WKWebViewConfiguration associated with |browser_state|.
 //
 // Note: Callers are responsible for releasing the returned WKWebView.
 WKWebView* CreateWKWebView(CGRect frame,
                            WKWebViewConfiguration* configuration,
                            BrowserState* browser_state,
-                           BOOL use_desktop_user_agent);
+                           BOOL use_desktop_user_agent) NS_RETURNS_RETAINED;
 
 // Creates and returns a new WKWebView for displaying regular web content.
 // The preconditions for the creation of a WKWebView are the same as the
 // previous method.
 // Note: Callers are responsible for releasing the returned WKWebView.
 WKWebView* CreateWKWebView(CGRect frame,
                            WKWebViewConfiguration* configuration,
-                           BrowserState* browser_state);
+                           BrowserState* browser_state) NS_RETURNS_RETAINED;
 
 }  // namespace web
 
 #endif  // IOS_WEB_WEB_STATE_WEB_VIEW_INTERNAL_CREATION_UTIL_H_