New TimeToFirstURLJob* navigation metrics now work with PlzNavigate.

content/browser/loader/navigation_url_loader_impl_core.cc

 // 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.
 
 #include "content/browser/loader/navigation_url_loader_impl_core.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "content/browser/frame_host/navigation_request_info.h"
 #include "content/browser/loader/navigation_resource_handler.h"
@@ skipping 83 matching lines @@
 
 void NavigationURLLoaderImplCore::NotifyRequestFailed(int net_error) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&NavigationURLLoaderImpl::NotifyRequestFailed, loader_,
                  net_error));
 }
 
+void NavigationURLLoaderImplCore::NavigationRequested(
+    base::TimeTicks timestamp) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  BrowserThread::PostTask(
+      BrowserThread::UI, FROM_HERE,
+      base::Bind(&NavigationURLLoaderImpl::NavigationRequested, loader_,
+                 timestamp));

[davidben, 2015/01/28 21:33:27]

Rather than plumb this all the way to the RDH and back, perhaps just move it up
to the start of Start? It would also match OnRequestResource better in cases
where the RDH fails the request immediately.

[carlosk, 2015/01/30 14:01:47]

Done. I measured the time we'd not be accounting for and it's below 1ms.

+}
+
 }  // namespace content