Log visibility change for all fragments.

Bug: 30681771
Test: SettingsUnitTests

Refactor visibility logging from InstrumentedFragment into a mixin. And
apply mixin in remaining fragments.

Change-Id: Ibbb59904336254a3e4bb9e8c7d0b36e5a6bc2622

src/com/android/settings/OptionsMenuFragment.java

@@ -17,6 +17,8 @@ package com.android.settings;
 
 import android.os.Bundle;
 
+import com.android.settings.core.InstrumentedFragment;
+
 /**
  * Base class for a fragment that has the options menu.
  * SettingsPreferenceFragment automatically sets this, but some activities do not use