Adding DRP specfic UMA for FirstContentfulPaint

content/test/test_render_frame_host.cc

 // Copyright 2013 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/test/test_render_frame_host.h"
 
 #include "base/guid.h"
 #include "content/browser/frame_host/frame_tree.h"
 #include "content/browser/frame_host/navigation_handle_impl.h"
 #include "content/browser/frame_host/navigation_request.h"
@@ skipping 402 matching lines @@
   CHECK(url_loader);
 
   // If a non-empty |redirect_url| was provided, simulate a server redirect.
   if (!redirect_url.is_empty())
     url_loader->SimulateServerRedirect(redirect_url);
 
   // Simulate the network stack commit.
   scoped_refptr<ResourceResponse> response(new ResourceResponse);
   // TODO(carlosk): ideally with PlzNavigate it should be possible someday to
   // fully commit the navigation at this call to CallOnResponseStarted.
-  url_loader->CallOnResponseStarted(response, MakeEmptyStream());
+  url_loader->CallOnResponseStarted(response, MakeEmptyStream(), nullptr);
 }
 
 int32_t TestRenderFrameHost::ComputeNextPageID() {
   const NavigationEntryImpl* entry = static_cast<NavigationEntryImpl*>(
       frame_tree_node()->navigator()->GetController()->GetPendingEntry());
   DCHECK(!(entry && entry->site_instance()) ||
          entry->site_instance() == GetSiteInstance());
   // Entry can be null when committing an error page (the pending entry was
   // cleared during DidFailProvisionalLoad).
   int page_id = entry ? entry->GetPageID() : -1;
   if (page_id == -1) {
     WebContentsImpl* web_contents = static_cast<WebContentsImpl*>(delegate());
     page_id = web_contents->GetMaxPageIDForSiteInstance(GetSiteInstance()) + 1;
   }
   return page_id;
 }
 
 }  // namespace content