Adding DRP specfic UMA for FirstContentfulPaint

content/content_browser.gypi

 # 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base_static',
     '../cc/cc.gyp:cc',
     '../cc/cc.gyp:cc_surfaces',
     '../components/components.gyp:display_compositor',
@@ skipping 210 matching lines @@
       'public/browser/message_port_provider.h',
       'public/browser/mojo_app_connection.h',
       'public/browser/native_web_keyboard_event.h',
       'public/browser/navigation_controller.cc',
       'public/browser/navigation_controller.h',
       'public/browser/navigation_details.cc',
       'public/browser/navigation_details.h',
       'public/browser/navigation_entry.h',
       'public/browser/navigation_handle.cc',
       'public/browser/navigation_handle.h',
+      'public/browser/navigation_data.h',
       'public/browser/navigation_throttle.cc',
       'public/browser/navigation_throttle.h',
       'public/browser/navigation_type.h',
       'public/browser/notification_database_data.h',
       'public/browser/notification_details.h',
       'public/browser/notification_event_dispatcher.h',
       'public/browser/notification_observer.h',
       'public/browser/notification_registrar.cc',
       'public/browser/notification_registrar.h',
       'public/browser/notification_service.h',
@@ skipping 1971 matching lines @@
       ],
     }],
     ['OS != "mac" and OS != "android"', {
       'sources!': [
         'browser/gpu/gpu_surface_tracker.cc',
         'browser/gpu/gpu_surface_tracker.h',
       ],
     }],
   ],
 }