Added accessor for the ukm service to the browser process singleton

chrome/browser/browser_process_impl.h

 // 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.
 
 // When each service is created, we set a flag indicating this. At this point,
 // the service initialization could fail or succeed. This allows us to remember
 // if we tried to create a service, and not try creating it over and over if
 // the creation failed.
 
 #ifndef CHROME_BROWSER_BROWSER_PROCESS_IMPL_H_
@@ skipping 78 matching lines @@
   void PostDestroyThreads();
 #endif
 
   // BrowserProcess implementation.
   void ResourceDispatcherHostCreated() override;
   void EndSession() override;
   metrics_services_manager::MetricsServicesManager* GetMetricsServicesManager()
       override;
   metrics::MetricsService* metrics_service() override;
   rappor::RapporServiceImpl* rappor_service() override;
+  ukm::UkmService* ukm_service() override;
   IOThread* io_thread() override;
   WatchDogThread* watchdog_thread() override;
   ProfileManager* profile_manager() override;
   PrefService* local_state() override;
   net::URLRequestContextGetter* system_request_context() override;
   variations::VariationsService* variations_service() override;
   BrowserProcessPlatformPart* platform_part() override;
   extensions::EventRouterForwarder* extension_event_router_forwarder() override;
   NotificationUIManager* notification_ui_manager() override;
   NotificationPlatformBridge* notification_platform_bridge() override;
@@ skipping 240 matching lines @@
 
   shell_integration::DefaultWebClientState cached_default_web_client_state_;
 
   std::unique_ptr<physical_web::PhysicalWebDataSource>
       physical_web_data_source_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserProcessImpl);
 };
 
 #endif  // CHROME_BROWSER_BROWSER_PROCESS_IMPL_H_