New TimeToFirstURLJob* navigation metrics now work with PlzNavigate.

content/browser/loader/resource_dispatcher_host_impl.cc

 // Copyright (c) 2012 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.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 
 #include <algorithm>
 #include <set>
@@ skipping 960 matching lines @@
   filter_ = NULL;
   return handled;
 }
 
 void ResourceDispatcherHostImpl::OnRequestResource(
     int routing_id,
     int request_id,
     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,
         FROM_HERE,
         base::Bind(&LogResourceRequestTimeOnUI,
                    TimeTicks::Now(),
                    filter_->child_id(),
                    request_data.render_frame_id,
                    request_data.url));
   }
@@ skipping 1375 matching lines @@
 
   // Add a flag to selectively bypass the data reduction proxy if the resource
   // type is not an image.
   if (request_data.resource_type != RESOURCE_TYPE_IMAGE)
     load_flags |= net::LOAD_BYPASS_DATA_REDUCTION_PROXY;
 
   return load_flags;
 }
 
 }  // namespace content