New TimeToFirstURLJob* navigation metrics now work with PlzNavigate.

content/browser/loader/navigation_url_loader_impl_core.cc

Index: content/browser/loader/navigation_url_loader_impl_core.cc
diff --git a/content/browser/loader/navigation_url_loader_impl_core.cc b/content/browser/loader/navigation_url_loader_impl_core.cc
index 48845e8aa0c26976ecb6eee07461a88ef7ea4a1a..63e65928e05480e12fcb88d8f7c5e50f1b9d0251 100644
--- a/content/browser/loader/navigation_url_loader_impl_core.cc
+++ b/content/browser/loader/navigation_url_loader_impl_core.cc
@@ -101,4 +101,13 @@ void NavigationURLLoaderImplCore::NotifyRequestFailed(int net_error) {
                  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