Use kMetricsReportingEnabled instead of kStatsReporingPref on metrics side

chrome/browser/metrics/chrome_metrics_services_manager_client.cc

Index: chrome/browser/metrics/chrome_metrics_services_manager_client.cc
diff --git a/chrome/browser/metrics/chrome_metrics_services_manager_client.cc b/chrome/browser/metrics/chrome_metrics_services_manager_client.cc
index 81188abb9677b3043801bd3041a1ed3d665a6fde..404a57d6659666c3fff06b288d089507045bac1f 100644
--- a/chrome/browser/metrics/chrome_metrics_services_manager_client.cc
+++ b/chrome/browser/metrics/chrome_metrics_services_manager_client.cc
@@ -20,6 +20,11 @@
 #include "components/variations/service/variations_service.h"
 #include "content/public/browser/browser_thread.h"
 
+#if defined(OS_CHROMEOS)
+#include "chrome/browser/chromeos/settings/cros_settings.h"
+#include "chromeos/settings/cros_settings_names.h"
+#endif  // defined(OS_CHROMEOS)
+
 namespace {
 
 // Posts |GoogleUpdateSettings::StoreMetricsClientInfo| on blocking pool thread
@@ -30,12 +35,25 @@ void PostStoreMetricsClientInfo(const metrics::ClientInfo& client_info) {
       base::Bind(&GoogleUpdateSettings::StoreMetricsClientInfo, client_info));
 }
 
+// Initialize kMetricsReportingEnabled based on kStatsReportingPref device
+// setting and add an observer as it is the source of truth on Chrome OS.
+void SetupMetricsStateForChromeOS() {

[Alexei Svitkine (slow), 2015/11/02 21:50:32]

Suggest moving this to metrics_reporting_state.cc and then
OnDeviceSettingChange() can be a local method to that file in the anon
namespace.

[gayane -on leave until 09-2017, 2015/11/03 19:46:17]

Done.

+#if defined(OS_CHROMEOS)
+  chromeos::CrosSettings::Get()->AddSettingsObserver(
+      chromeos::kStatsReportingPref, base::Bind(&onDeviceSettingsChange));
+
+  onDeviceSettingsChange();
+#endif // defined(OS_CHROMEOS)
+}
+
 }  // namespace
 
 ChromeMetricsServicesManagerClient::ChromeMetricsServicesManagerClient(
     PrefService* local_state)
     : local_state_(local_state) {
   DCHECK(local_state);
+
+  SetupMetricsStateForChromeOS();
 }
 
 ChromeMetricsServicesManagerClient::~ChromeMetricsServicesManagerClient() {}