Headless: Pass devtools request id to the URLFetcher

headless/public/util/url_fetcher.h

Index: headless/public/util/url_fetcher.h
diff --git a/headless/public/util/url_fetcher.h b/headless/public/util/url_fetcher.h
index ac4bbc51426b29b3f290b3cafdbe1c89652f700b..3ea1658d08c5462e8bbf9c914e8777c62a5850b2 100644
--- a/headless/public/util/url_fetcher.h
+++ b/headless/public/util/url_fetcher.h
@@ -63,7 +63,13 @@ class URLFetcher {
   virtual void StartFetch(const GURL& rewritten_url,
                           const std::string& method,
                           const net::HttpRequestHeaders& request_headers,
-                          ResultListener* result_listener) = 0;
+                          const std::string& devtools_request_id,
+                          ResultListener* result_listener);
+  //  TODO(alexclarke): Make the above pure virtual and remove this.
+  virtual void StartFetch(const GURL& rewritten_url,
+                          const std::string& method,
+                          const net::HttpRequestHeaders& request_headers,
+                          ResultListener* result_listener);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(URLFetcher);