Adding DRP specfic UMA for FirstContentfulPaint

content/browser/loader/resource_dispatcher_host_impl.h

Index: content/browser/loader/resource_dispatcher_host_impl.h
diff --git a/content/browser/loader/resource_dispatcher_host_impl.h b/content/browser/loader/resource_dispatcher_host_impl.h
index 6d5602b670e849d673fd181a4ad7e31bcd2d753f..3d9dafd5957ddf31611dc00b664569b981bc5769 100644
--- a/content/browser/loader/resource_dispatcher_host_impl.h
+++ b/content/browser/loader/resource_dispatcher_host_impl.h
@@ -20,20 +20,21 @@
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "content/browser/download/download_resource_handler.h"
 #include "content/browser/download/save_types.h"
+#include "content/browser/frame_host/navigation_user_data.h"
 #include "content/browser/loader/global_routing_id.h"
 #include "content/browser/loader/resource_loader.h"
 #include "content/browser/loader/resource_loader_delegate.h"
 #include "content/browser/loader/resource_scheduler.h"
 #include "content/common/content_export.h"
 #include "content/common/resource_request_body.h"
 #include "content/public/browser/child_process_data.h"
 #include "content/public/browser/download_item.h"
 #include "content/public/browser/download_url_parameters.h"
 #include "content/public/browser/global_request_id.h"
@@ -58,20 +59,21 @@ class URLRequestJobFactory;
 }
 
 namespace storage {
 class ShareableFileReference;
 }
 
 namespace content {
 class AppCacheService;
 class AsyncRevalidationManager;
 class FrameTree;
+class NavigationSupportsUserData;
 class NavigationURLLoaderImplCore;
 class RenderFrameHostImpl;
 class ResourceContext;
 class ResourceDispatcherHostDelegate;
 class ResourceMessageDelegate;
 class ResourceMessageFilter;
 class ResourceRequestInfoImpl;
 class SaveFileManager;
 class ServiceWorkerNavigationHandleCore;
 class WebContentsImpl;