Introduce WebRequestEventRouterDelegate.

chrome/browser/extensions/api/web_request/web_request_api_helpers.h

 // Copyright (c) 2012 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.
 
 // Helper classes and functions used for the WebRequest API.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_WEB_REQUEST_WEB_REQUEST_API_HELPERS_H_
 #define CHROME_BROWSER_EXTENSIONS_API_WEB_REQUEST_WEB_REQUEST_API_HELPERS_H_
 
 #include <list>
@@ skipping 19 matching lines @@
 class Extension;
 }
 
 namespace net {
 class BoundNetLog;
 class URLRequest;
 }
 
 namespace extension_web_request_api_helpers {
 
+#define ARRAYEND(array) (array + arraysize(array))
+
 typedef std::pair<std::string, std::string> ResponseHeader;
 typedef std::vector<ResponseHeader> ResponseHeaders;
 
 // Data container for RequestCookies as defined in the declarative WebRequest
 // API definition.
 struct RequestCookie {
   RequestCookie();
   ~RequestCookie();
   scoped_ptr<std::string> name;
   scoped_ptr<std::string> value;
@@ skipping 255 matching lines @@
 void ClearCacheOnNavigation();
 
 // Tells renderer processes that the web request or declarative web request
 // API has been used by |extension| in browser_context |browser_context_id| to
 // collect UMA statistics on Page Load Times. Needs to be called on the UI
 // thread.
 void NotifyWebRequestAPIUsed(
     void* browser_context_id,
     scoped_refptr<const extensions::Extension> extension);
 
+// Converts the |name|, |value| pair of a http header to a HttpHeaders
+// dictionary. Ownership is passed to the caller.
+base::DictionaryValue* ToHeaderDictionary(
+    const std::string& name, const std::string& value);
+
 }  // namespace extension_web_request_api_helpers
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_WEB_REQUEST_WEB_REQUEST_API_HELPERS_H_