Adding DRP specfic UMA for FirstContentfulPaint

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 <memory>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.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 NavigationData;
 class ServiceWorkerNavigationHandle;
 class StreamHandle;
 struct ResourceResponse;
 
 class NavigationURLLoaderImpl : public NavigationURLLoader {
  public:
   // The caller is responsible for ensuring that |delegate| outlives the loader.
   NavigationURLLoaderImpl(BrowserContext* browser_context,
                           std::unique_ptr<NavigationRequestInfo> request_info,
                           ServiceWorkerNavigationHandle* service_worker_handle,
                           NavigationURLLoaderDelegate* delegate);
   ~NavigationURLLoaderImpl() override;
 
   // NavigationURLLoader implementation.
   void FollowRedirect() override;
   void ProceedWithResponse() override;
 
  private:
   friend class NavigationURLLoaderImplCore;
 
   // Notifies the delegate of a redirect.
   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,
-                             std::unique_ptr<StreamHandle> body);
+                             std::unique_ptr<StreamHandle> body,
+                             std::unique_ptr<NavigationData> navigation_data);
 
   // Notifies the delegate the request failed to return a response.
   void NotifyRequestFailed(bool in_cache, 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_