New TimeToFirstURLJob* navigation metrics now work with PlzNavigate.

content/browser/loader/navigation_url_loader_impl.h

 // 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.
 
 #ifndef CONTENT_BROWSER_LOADER_NAVIGATION_URL_LOADER_IMPL_H_
 #define CONTENT_BROWSER_LOADER_NAVIGATION_URL_LOADER_IMPL_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
+#include "base/time/time.h"
 #include "content/browser/loader/navigation_url_loader.h"
 
 namespace net {
 struct RedirectInfo;
 }
 
 namespace content {
 
 class NavigationURLLoaderImplCore;
 class StreamHandle;
@@ skipping 21 matching lines @@
   void NotifyRequestRedirected(const net::RedirectInfo& redirect_info,
                                const scoped_refptr<ResourceResponse>& response);
 
   // Notifies the delegate that the response has started.
   void NotifyResponseStarted(const scoped_refptr<ResourceResponse>& response,
                              scoped_ptr<StreamHandle> body);
 
   // Notifies the delegate the request failed to return a response.
   void NotifyRequestFailed(int net_error);
 
+  // Notifies the delegate the begin navigation request was handled and a
+  // potential first network request is about to be made.
+  void NotifyRequestStarted(base::TimeTicks timestamp);
+
   NavigationURLLoaderDelegate* delegate_;
 
   // |core_| is deleted on the IO thread in a subsequent task when the
   // NavigationURLLoaderImpl goes out of scope.
   NavigationURLLoaderImplCore* core_;
 
   base::WeakPtrFactory<NavigationURLLoaderImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationURLLoaderImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_NAVIGATION_URL_LOADER_IMPL_H_