Media Engagement: implement shell of the media engagement service.

chrome/browser/profiles/chrome_browser_main_extra_parts_profiles.cc

Index: chrome/browser/profiles/chrome_browser_main_extra_parts_profiles.cc
diff --git a/chrome/browser/profiles/chrome_browser_main_extra_parts_profiles.cc b/chrome/browser/profiles/chrome_browser_main_extra_parts_profiles.cc
index 33201052f33cb3205a8043c856e058d0a42e6df4..42114fc8f33357a64dc128ce99cd15a28ce09165 100644
--- a/chrome/browser/profiles/chrome_browser_main_extra_parts_profiles.cc
+++ b/chrome/browser/profiles/chrome_browser_main_extra_parts_profiles.cc
@@ -28,6 +28,8 @@
 #include "chrome/browser/google/google_url_tracker_factory.h"
 #include "chrome/browser/history/history_service_factory.h"
 #include "chrome/browser/invalidation/profile_invalidation_provider_factory.h"
+#include "chrome/browser/media/media_engagement_service.h"
+#include "chrome/browser/media/media_engagement_service_factory.h"
 #include "chrome/browser/media/router/media_router_factory.h"
 #include "chrome/browser/media_galleries/media_galleries_preferences_factory.h"
 #include "chrome/browser/net/nqe/ui_network_quality_estimator_service_factory.h"
@@ -269,6 +271,8 @@ EnsureBrowserContextKeyedServiceFactoriesBuilt() {
       ->SetUIDelegateFactory(std::move(networking_private_ui_delegate_factory));
 #endif
 #endif
+  if (MediaEngagementService::IsEnabled())
+    MediaEngagementServiceFactory::GetInstance();
   media_router::MediaRouterFactory::GetInstance();
 #if !defined(OS_ANDROID)
   media_router::MediaRouterUIServiceFactory::GetInstance();