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/deviceinfo/StorageSettings.java

@@ -235,8 +235,8 @@ public class StorageSettings extends SettingsPreferenceFragment implements Index
             final Bundle args = new Bundle();
             args.putString(VolumeInfo.EXTRA_VOLUME_ID, VolumeInfo.ID_PRIVATE_INTERNAL);
             Intent intent = Utils.onBuildStartFragmentIntent(getActivity(),
-                    StorageDashboardFragment.class.getName(), args, null, R.string.apps_storage, null,
-                    false);
+                    StorageDashboardFragment.class.getName(), args, null, R.string.apps_storage,
+                    null, false, getMetricsCategory());
             intent.putExtra(SettingsDrawerActivity.EXTRA_SHOW_MENU, true);
             getActivity().startActivity(intent);
             finish();