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/dashboard/conditional/BatterySaverCondition.java

@@ -56,7 +56,7 @@ public class BatterySaverCondition extends Condition {
     @Override
     public void onPrimaryClick() {
         Utils.startWithFragment(mManager.getContext(), BatterySaverSettings.class.getName(), null,
-                null, 0, R.string.battery_saver, null);
+                null, 0, R.string.battery_saver, null, MetricsEvent.DASHBOARD_SUMMARY);
     }
 
     @Override