Add page creation latency for updatePreferenceStates

- The updatePreferenceStates is called in the onResume. Here creates a new enum to
  record the elapsed time.

Bug: 137558156
Test: make RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.dashboard
Test: make RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.core
Change-Id: I02bdbeecd61fbc0082eea19ea64cbfe7541a6970

src/com/android/settings/core/InstrumentedPreferenceFragment.java

@@ -98,6 +98,10 @@ public abstract class InstrumentedPreferenceFragment extends ObservablePreferenc
         return -1;
     }
 
+    protected void writeElapsedTimeMetric(int action, String key) {
+        mVisibilityLoggerMixin.writeElapsedTimeMetric(action, key);
+    }
+
     private void updateActivityTitleWithScreenTitle(PreferenceScreen screen) {
         if (screen != null) {
             final CharSequence title = screen.getTitle();