Flush UKM metrics when backgrounded on Android and iOS.

ios/chrome/browser/application_context_impl.cc

 // Copyright 2014 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/application_context_impl.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 13 matching lines @@
 #include "components/history/core/browser/history_service.h"
 #include "components/keyed_service/core/service_access_type.h"
 #include "components/metrics/metrics_service.h"
 #include "components/metrics_services_manager/metrics_services_manager.h"
 #include "components/net_log/chrome_net_log.h"
 #include "components/network_time/network_time_tracker.h"
 #include "components/physical_web/data_source/physical_web_data_source.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/pref_service.h"
 #include "components/translate/core/browser/translate_download_manager.h"
+#include "components/ukm/ukm_service.h"
 #include "components/update_client/configurator.h"
 #include "components/update_client/update_query_params.h"
 #include "components/variations/service/variations_service.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state_manager_impl.h"
 #include "ios/chrome/browser/chrome_paths.h"
 #include "ios/chrome/browser/component_updater/ios_component_updater_configurator.h"
 #include "ios/chrome/browser/history/history_service_factory.h"
 #include "ios/chrome/browser/ios_chrome_io_thread.h"
 #include "ios/chrome/browser/metrics/ios_chrome_metrics_services_manager_client.h"
@@ skipping 80 matching lines @@
   // having stopped.
   ios_chrome_io_thread_.reset();
 }
 
 void ApplicationContextImpl::OnAppEnterForeground() {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   PrefService* local_state = GetLocalState();
   local_state->SetBoolean(prefs::kLastSessionExitedCleanly, false);
 
-  // Tell the metrics service that the application resumes.
+  // Tell the metrics services that the application resumes.
   metrics::MetricsService* metrics_service = GetMetricsService();
   if (metrics_service && local_state) {
     metrics_service->OnAppEnterForeground();
     local_state->CommitPendingWrite();
   }
-
   variations::VariationsService* variations_service = GetVariationsService();
   if (variations_service)
     variations_service->OnAppEnterForeground();
+  ukm::UkmService* ukm_service = g_browser_process->ukm_service();
+  if (ukm_service)
+    ukm_service->OnAppEnterForeground();
 }
 
 void ApplicationContextImpl::OnAppEnterBackground() {
   DCHECK(thread_checker_.CalledOnValidThread());
   // Mark all the ChromeBrowserStates as clean and persist history.
   std::vector<ios::ChromeBrowserState*> loaded_browser_state =
       GetChromeBrowserStateManager()->GetLoadedBrowserStates();
   for (ios::ChromeBrowserState* browser_state : loaded_browser_state) {
     if (history::HistoryService* history_service =
             ios::HistoryServiceFactory::GetForBrowserStateIfExists(
                 browser_state, ServiceAccessType::EXPLICIT_ACCESS)) {
       history_service->HandleBackgrounding();
     }
 
     PrefService* browser_state_prefs = browser_state->GetPrefs();
     if (browser_state_prefs)
       browser_state_prefs->CommitPendingWrite();
   }
 
   PrefService* local_state = GetLocalState();
   local_state->SetBoolean(prefs::kLastSessionExitedCleanly, true);
 
-  // Tell the metrics service it was cleanly shutdown.
+  // Tell the metrics services they were cleanly shutdown.
   metrics::MetricsService* metrics_service = GetMetricsService();
   if (metrics_service && local_state)
     metrics_service->OnAppEnterBackground();
+  ukm::UkmService* ukm_service = g_browser_process->ukm_service();
+  if (ukm_service)
+    ukm_service->OnAppEnterBackground();
 
   // Persisting to disk is protected by a critical task, so no other special
   // handling is necessary on iOS.
 }
 
 bool ApplicationContextImpl::WasLastShutdownClean() {
   DCHECK(thread_checker_.CalledOnValidThread());
   // Make sure the locale state is created as the file is initialized there.
   ignore_result(GetLocalState());
   return was_last_shutdown_clean_;
@@ skipping 166 matching lines @@
           base::SequencedWorkerPool::SKIP_ON_SHUTDOWN));
 
   gcm_driver_ = gcm::CreateGCMDriverDesktop(
       base::WrapUnique(new gcm::GCMClientFactory), GetLocalState(), store_path,
       GetSystemURLRequestContext(), ::GetChannel(),
       IOSChromeGCMProfileServiceFactory::GetProductCategoryForSubtypes(),
       web::WebThread::GetTaskRunnerForThread(web::WebThread::UI),
       web::WebThread::GetTaskRunnerForThread(web::WebThread::IO),
       blocking_task_runner);
 }