Adding DRP specfic UMA for FirstContentfulPaint

content/browser/loader/resource_loader.h

Index: content/browser/loader/resource_loader.h
diff --git a/content/browser/loader/resource_loader.h b/content/browser/loader/resource_loader.h
index 5b5ecdb500e62a820c04bb0a01dd5188f9c4187e..96619c694ff0fcd94c6012a9c9481c6711883ce5 100644
--- a/content/browser/loader/resource_loader.h
+++ b/content/browser/loader/resource_loader.h
@@ -18,32 +18,36 @@
 #include "net/url_request/url_request.h"
 
 namespace net {
 class X509Certificate;
 }
 
 namespace content {
 class ResourceDispatcherHostLoginDelegate;
 class ResourceLoaderDelegate;
 class ResourceRequestInfoImpl;
+class ResourceDispatcherHostDelegate;
+class ResourceContext;
 
 // This class is responsible for driving the URLRequest (i.e., calling Start,
 // Read, and servicing events).  It has a ResourceHandler, which is typically a
 // chain of ResourceHandlers, and is the ResourceController for its handler.
 class CONTENT_EXPORT ResourceLoader : public net::URLRequest::Delegate,
                                       public SSLErrorHandler::Delegate,
                                       public SSLClientAuthHandler::Delegate,
                                       public ResourceController {
  public:
   ResourceLoader(scoped_ptr<net::URLRequest> request,
                  scoped_ptr<ResourceHandler> handler,
-                 ResourceLoaderDelegate* delegate);
+                 ResourceLoaderDelegate* delegate,
+                 ResourceDispatcherHostDelegate* host_delegate,
+                 ResourceContext* resource_context);
   ~ResourceLoader() override;
 
   void StartRequest();
   void CancelRequest(bool from_renderer);
 
   bool is_transferring() const { return is_transferring_; }
   void MarkAsTransferring();
   void CompleteTransfer();
 
   net::URLRequest* request() { return request_.get(); }
@@ -121,20 +125,22 @@ class CONTENT_EXPORT ResourceLoader : public net::URLRequest::Delegate,
     DEFERRED_REDIRECT,
     DEFERRED_READ,
     DEFERRED_RESPONSE_COMPLETE,
     DEFERRED_FINISH
   };
   DeferredStage deferred_stage_;
 
   scoped_ptr<net::URLRequest> request_;
   scoped_ptr<ResourceHandler> handler_;
   ResourceLoaderDelegate* delegate_;
+  ResourceDispatcherHostDelegate* host_delegate_;
+  ResourceContext* resource_context_;
 
   scoped_refptr<ResourceDispatcherHostLoginDelegate> login_delegate_;
   scoped_ptr<SSLClientAuthHandler> ssl_client_auth_handler_;
 
   base::TimeTicks read_deferral_start_time_;
 
   // Indicates that we are in a state of being transferred to a new downstream
   // consumer.  We are waiting for a notification to complete the transfer, at
   // which point we'll receive a new ResourceHandler.
   bool is_transferring_;