New TimeToFirstURLJob* navigation metrics now work with PlzNavigate.

content/browser/loader/resource_dispatcher_host_impl.cc

Index: content/browser/loader/resource_dispatcher_host_impl.cc
diff --git a/content/browser/loader/resource_dispatcher_host_impl.cc b/content/browser/loader/resource_dispatcher_host_impl.cc
index 332b7ec84a98ee2d3eb9ef55ad006f4b1594e59f..b67b3a7547459fc027bdad571d93b3b8861211f3 100644
--- a/content/browser/loader/resource_dispatcher_host_impl.cc
+++ b/content/browser/loader/resource_dispatcher_host_impl.cc
@@ -978,7 +978,9 @@ void ResourceDispatcherHostImpl::OnRequestResource(
     const ResourceHostMsg_Request& request_data) {
   // When logging time-to-network only care about main frame and non-transfer
   // navigations.
-  if (request_data.resource_type == RESOURCE_TYPE_MAIN_FRAME &&
+  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableBrowserSideNavigation) &&

[nasko, 2015/02/02 18:28:53]

nit: Checking the resource type is a very simple comparison, which will short
circuit the if statement quickly if false. Let's put the more expensive
HasSwitch call as the last check.

[carlosk, 2015/02/03 11:00:04]

Done. I wasn't aware it was expensive.

[nasko, 2015/02/03 23:51:56]

It is "expensive" relatively speaking. It is a lookup in some structure of all
flags. It will always be more expensive than a straight comparison of POD
values.

[carlosk, 2015/02/04 10:21:32]

Acknowledged.

+      request_data.resource_type == RESOURCE_TYPE_MAIN_FRAME &&
       request_data.transferred_request_request_id == -1) {
     BrowserThread::PostTask(
         BrowserThread::UI,