Correctly record and pass around navigation start time.

mojo/services/network/public/interfaces/url_loader.mojom

 // 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.
 
 module mojo;
 
 import "network/public/interfaces/http_message.mojom";
 import "network/public/interfaces/network_error.mojom";
 
 struct URLRequest {
@@ skipping 17 matching lines @@
 
   // If set to true, then redirects will be automatically followed. Otherwise,
   // when a redirect is encounterd, FollowRedirect must be called to proceed.
   bool auto_follow_redirects = false;
 
   // If set to true, then the HTTP request will bypass the local cache and will
   // have a 'Cache-Control: nocache' header added in that causes any proxy
   // servers to also not satisfy the request from their cache.  This has the
   // effect of forcing a full end-to-end fetch.
   bool bypass_cache = false;
+
+  // The time when this request originated. 0 indicates that it is not recorded.
+  int64 originating_time_ticks = 0;
 };
 
 struct URLResponse {
   // If the response resulted in a network level error, this field will be set.
   NetworkError? error;
 
   // The response body stream. Read from this data pipe to receive the bytes of
   // response body.
   handle<data_pipe_consumer>? body;
 
@@ skipping 47 matching lines @@
   Start(URLRequest request) => (URLResponse response);
 
   // If the request passed to |Start| had |auto_follow_redirects| set to false,
   // then upon receiving an URLResponse with a non-NULL |redirect_url| field,
   // |FollowRedirect| may be called to load the URL indicated by the redirect.
   FollowRedirect() => (URLResponse response);
 
   // Query status about the URLLoader.
   QueryStatus() => (URLLoaderStatus status);
 };