Log source with visibility change

- Add a method in VisibilityLoggerMixin to log visible event using
  LogMaker, which allows logging additional FIELD_CONTEXT field.
- In Utils.startFragment, add current page's metricsCategory as an extra
  to next page.
- In next page's onResume(), extract the previous page's metricsCategory
  and send it to VisibilityLoggerMixin.visible()
- Update all caller with additional paramters

Change-Id: I8e1f2597fa465b7d3aa16fa1d21c052a3219694a
Fix: 35359289
Test: RunSettingsRoboTests

src/com/android/settings/notification/AppNotificationSettings.java

@@ -198,7 +198,7 @@ public class AppNotificationSettings extends NotificationSettingsBase {
                         channelArgs.putString(Settings.EXTRA_CHANNEL_ID, channel.getId());
                         Intent channelIntent = Utils.onBuildStartFragmentIntent(getActivity(),
                                 ChannelNotificationSettings.class.getName(),
-                                channelArgs, null, 0, null, false);
+                                channelArgs, null, 0, null, false, getMetricsCategory());
                         channelPref.setIntent(channelIntent);
 
                         channelPref.setOnPreferenceChangeListener(