Added support for multiple urls in the component updater.

chrome/browser/component_updater/component_updater_utils.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 CHROME_BROWSER_COMPONENT_UPDATER_COMPONENT_UPDATER_UTILS_H_
 #define CHROME_BROWSER_COMPONENT_UPDATER_COMPONENT_UPDATER_UTILS_H_
 
 #include <string>
 
 class GURL;
 
 namespace base {
 class FilePath;
 }
 
 namespace net {
 class URLFetcher;
 class URLFetcherDelegate;
 class URLRequestContextGetter;
 }
 
 namespace component_updater {
 
+struct CrxUpdateItem;
+
 // An update protocol request starts with a common preamble which includes
 // version and platform information for Chrome and the operating system,
 // followed by a request body, which is the actual payload of the request.
 // For example:
 //
 // <?xml version="1.0" encoding="UTF-8"?>
 // <request protocol="3.0" version="chrome-32.0.1.0"  prodversion="32.0.1.0"
 //        requestid="{7383396D-B4DD-46E1-9104-AAC6B918E792}"
 //        updaterchannel="canary" arch="x86" nacl_arch="x86-64"
 //        ADDITIONAL ATTRIBUTES>
@@ skipping 19 matching lines @@
 
 // Returns true if the url request of |fetcher| was succesful.
 bool FetchSuccess(const net::URLFetcher& fetcher);
 
 // Returns the error code which occured during the fetch. The function returns 0
 // if the fetch was successful. If errors happen, the function could return a
 // network error, an http response code, or the status of the fetch, if the
 // fetch is pending or canceled.
 int GetFetchError(const net::URLFetcher& fetcher);
 
+// Returns true if the |update_item| contains a valid differential update url.
+bool HasDiffUpdate(const CrxUpdateItem* update_item);
+
 // Returns true if the |status_code| represents a server error 5xx.
 bool IsHttpServerError(int status_code);
 
 // Deletes the file and its directory, if the directory is empty. If the
 // parent directory is not empty, the function ignores deleting the directory.
 // Returns true if the file and the empty directory are deleted.
 bool DeleteFileAndEmptyParentDirectory(const base::FilePath& filepath);
 
 }  // namespace component_updater
 
 #endif  // CHROME_BROWSER_COMPONENT_UPDATER_COMPONENT_UPDATER_UTILS_H_