Basic UkmService implementation

ios/chrome/browser/metrics/ios_chrome_metrics_service_client.mm

 // Copyright 2015 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.
 
 #include "ios/chrome/browser/metrics/ios_chrome_metrics_service_client.h"
 
 #include <stdint.h>
 
 #include <utility>
 #include <vector>
@@ skipping 23 matching lines @@
 #include "components/metrics/profiler/tracking_synchronizer.h"
 #include "components/metrics/stability_metrics_helper.h"
 #include "components/metrics/ui/screen_info_metrics_provider.h"
 #include "components/metrics/url_constants.h"
 #include "components/omnibox/browser/omnibox_metrics_provider.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/pref_service.h"
 #include "components/signin/core/browser/signin_status_metrics_provider.h"
 #include "components/sync/device_info/device_count_metrics_provider.h"
 #include "components/translate/core/browser/translate_ranker_metrics_provider.h"
+#include "components/ukm/ukm_service.h"
 #include "components/variations/variations_associated_data.h"
 #include "components/version_info/version_info.h"
 #include "ios/chrome/browser/application_context.h"
 #include "ios/chrome/browser/chrome_paths.h"
 #include "ios/chrome/browser/google/google_brand.h"
 #include "ios/chrome/browser/metrics/ios_chrome_stability_metrics_provider.h"
 #include "ios/chrome/browser/metrics/mobile_session_shutdown_metrics_provider.h"
 #include "ios/chrome/browser/signin/ios_chrome_signin_status_metrics_provider_delegate.h"
 #include "ios/chrome/browser/sync/ios_chrome_sync_client.h"
 #include "ios/chrome/browser/tab_parenting_global_observer.h"
@@ skipping 30 matching lines @@
 
   return client;
 }
 
 // static
 void IOSChromeMetricsServiceClient::RegisterPrefs(
     PrefRegistrySimple* registry) {
   metrics::MetricsService::RegisterPrefs(registry);
   metrics::StabilityMetricsHelper::RegisterPrefs(registry);
   metrics::RegisterMetricsReportingStatePrefs(registry);
+  ukm::UkmService::RegisterPrefs(registry);
 }
 
 metrics::MetricsService* IOSChromeMetricsServiceClient::GetMetricsService() {
   return metrics_service_.get();
 }
 
+metrics::MetricsService* IOSChromeMetricsServiceClient::GetMetricsService() {
+  return ukm_service_.get();
+}
+
 void IOSChromeMetricsServiceClient::SetMetricsClientId(
     const std::string& client_id) {
   crash_keys::SetMetricsClientIdFromGUID(client_id);
 }
 
 int32_t IOSChromeMetricsServiceClient::GetProduct() {
   return metrics::ChromeUserMetricsExtension::CHROME;
 }
 
 std::string IOSChromeMetricsServiceClient::GetApplicationLocale() {
@@ skipping 65 matching lines @@
     web::WebState* web_state) {
   metrics_service_->OnApplicationNotIdle();
 }
 
 void IOSChromeMetricsServiceClient::WebStateDidStopLoading(
     web::WebState* web_state) {
   metrics_service_->OnApplicationNotIdle();
 }
 
 void IOSChromeMetricsServiceClient::Initialize() {
+  PrefService* local_state = GetApplicationContext()->GetLocalState();
   metrics_service_ = base::MakeUnique<metrics::MetricsService>(
-      metrics_state_manager_, this, GetApplicationContext()->GetLocalState());
+      metrics_state_manager_, this, local_state);
+
+  if (base::FeatureList::IsEnabled(kUkmFeature))
+    ukm_service_.reset(new ukm::UkmService(local_state, this));
 
   // Register metrics providers.
   metrics_service_->RegisterMetricsProvider(
       base::MakeUnique<metrics::NetworkMetricsProvider>(
           web::WebThread::GetBlockingPool()));
 
   // Currently, we configure OmniboxMetricsProvider to not log events to UMA
   // if there is a single incognito session visible. In the future, it may
   // be worth revisiting this to still log events from non-incognito sessions.
   metrics_service_->RegisterMetricsProvider(
@@ skipping 120 matching lines @@
 
 void IOSChromeMetricsServiceClient::OnURLOpenedFromOmnibox(OmniboxLog* log) {
   metrics_service_->OnApplicationNotIdle();
 }
 
 metrics::EnableMetricsDefault
 IOSChromeMetricsServiceClient::GetMetricsReportingDefaultState() {
   return metrics::GetMetricsReportingDefaultState(
       GetApplicationContext()->GetLocalState());
 }