Add support for mocking failed loads to WebURLLoaderMock.

webkit/support/weburl_loader_mock_factory.h

Index: webkit/support/weburl_loader_mock_factory.h
===================================================================
--- webkit/support/weburl_loader_mock_factory.h	(revision 148351)
+++ webkit/support/weburl_loader_mock_factory.h	(working copy)
@@ -43,6 +43,11 @@
                    const WebKit::WebURLResponse& response,
                    const WebKit::WebString& filePath);
 
+  // Registers an error to be served when the specified URL is requested.
+  void RegisterErrorURL(const WebKit::WebURL& url,
+                        const WebKit::WebURLResponse& response,
+                        const WebKit::WebURLError& error);
+
   // Unregisters |url| so it will no longer be mocked.
   void UnregisterURL(const WebKit::WebURL& url);
 
@@ -90,6 +95,9 @@
   typedef std::map<WebURLLoaderMock*, WebKit::WebURLRequest> LoaderToRequestMap;
   LoaderToRequestMap pending_loaders_;
 
+  typedef std::map<WebKit::WebURL, WebKit::WebURLError> URLToErrorMap;
+  URLToErrorMap url_to_error_info_;
+
   // Table of the registered URLs and the responses that they should receive.
   typedef std::map<WebKit::WebURL, ResponseInfo> URLToResponseMap;
   URLToResponseMap url_to_reponse_info_;