UKM Sync Observer

chrome/browser/metrics/chrome_metrics_service_client.h

Index: chrome/browser/metrics/chrome_metrics_service_client.h
diff --git a/chrome/browser/metrics/chrome_metrics_service_client.h b/chrome/browser/metrics/chrome_metrics_service_client.h
index 6f12e37422109a1ffcb9cbc022f1579a751d49fa..61dae93a411c5882701595f29cf46bb4108cd986 100644
--- a/chrome/browser/metrics/chrome_metrics_service_client.h
+++ b/chrome/browser/metrics/chrome_metrics_service_client.h
@@ -23,6 +23,7 @@
 #include "components/metrics/proto/system_profile.pb.h"
 #include "components/omnibox/browser/omnibox_event_global_tracker.h"
 #include "components/ukm/observers/history_delete_observer.h"
+#include "components/ukm/observers/sync_disable_observer.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "ppapi/features/features.h"
@@ -50,7 +51,8 @@ class ProfilerMetricsProvider;
 class ChromeMetricsServiceClient : public metrics::MetricsServiceClient,
                                    public metrics::TrackingSynchronizerObserver,
                                    public content::NotificationObserver,
-                                   public ukm::HistoryDeleteObserver {
+                                   public ukm::HistoryDeleteObserver,
+                                   public ukm::SyncDisableObserver {
  public:
   ~ChromeMetricsServiceClient() override;
 
@@ -86,9 +88,12 @@ class ChromeMetricsServiceClient : public metrics::MetricsServiceClient,
   metrics::EnableMetricsDefault GetMetricsReportingDefaultState() override;
   bool IsUMACellularUploadLogicEnabled() override;
 
-  // ukm::HistoryDeleteObserver
+  // ukm::HistoryDeleteObserver:
   void OnHistoryDeleted() override;
 
+  // ukm::SyncDisableObserver:
+  void OnSyncPrefsChanged(bool must_purge) override;
+
   // Persistent browser metrics need to be persisted somewhere. This constant
   // provides a known string to be used for both the allocator's internal name
   // and for a file on disk (relative to chrome::DIR_USER_DATA) to which they
@@ -142,8 +147,8 @@ class ChromeMetricsServiceClient : public metrics::MetricsServiceClient,
   // there was recent activity.
   void RegisterForNotifications();
 
-  // Call to listen for history deletions by the selected profile.
-  void RegisterForHistoryDeletions(Profile* profile);
+  // Call to listen for events on the selected profile's services.
+  void RegisterForProfileEvents(Profile* profile);
 
   // content::NotificationObserver:
   void Observe(int type,