Adding DRP specfic UMA for FirstContentfulPaint

chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.h

Index: chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.h
diff --git a/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.h b/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.h
index 25b26f125180e5dbcf41b400f5d4162b9148b0fd..95d590f6a385fcf078f24bb96252237aa48630c0 100644
--- a/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.h
+++ b/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.h
@@ -1,37 +1,42 @@
 // 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.
 
 #ifndef CHROME_BROWSER_RENDERER_HOST_CHROME_RESOURCE_DISPATCHER_HOST_DELEGATE_H_
 #define CHROME_BROWSER_RENDERER_HOST_CHROME_RESOURCE_DISPATCHER_HOST_DELEGATE_H_
 
 #include <map>
+#include <memory>
 #include <set>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/external_protocol/external_protocol_handler.h"
 #include "content/public/browser/resource_dispatcher_host_delegate.h"
 
 class DelayedResourceQueue;
 class DownloadRequestLimiter;
 
 namespace extensions {
 class UserScriptListener;
 }
 
 namespace safe_browsing {
 class SafeBrowsingService;
 }
 
+namespace content {
+class NavigationData;
+}
+
 // Implements ResourceDispatcherHostDelegate. Currently used by the Prerender
 // system to abort requests and add to the load flags when a request begins.
 class ChromeResourceDispatcherHostDelegate
     : public content::ResourceDispatcherHostDelegate {
  public:
   ChromeResourceDispatcherHostDelegate();
   ~ChromeResourceDispatcherHostDelegate() override;
 
   // ResourceDispatcherHostDelegate implementation.
   bool ShouldBeginRequest(const std::string& method,
@@ -84,20 +89,23 @@ class ChromeResourceDispatcherHostDelegate
   void RequestComplete(net::URLRequest* url_request) override;
   bool ShouldEnableLoFiMode(
       const net::URLRequest& url_request,
       content::ResourceContext* resource_context) override;
 
   // Called on the UI thread. Allows switching out the
   // ExternalProtocolHandler::Delegate for testing code.
   static void SetExternalProtocolHandlerDelegateForTesting(
       ExternalProtocolHandler::Delegate* delegate);
 
+  std::unique_ptr<content::NavigationData> GetNavigationData(

[nasko, 2016/04/26 20:18:39]

Keep the ordering the same as the inherited interface - this needs to move right
after ShouldEnableLoFiMode with no empty line between them.

[RyanSturm, 2016/04/27 23:27:46]

Done.

+      net::URLRequest* request) const override;
+
  private:
 #if defined(ENABLE_EXTENSIONS)
   struct StreamTargetInfo {
     std::string extension_id;
     std::string view_id;
   };
 #endif
 
   void AppendStandardResourceThrottles(
       net::URLRequest* request,