Fix loading screens for manage and running apps

Also add loading screen to manage permissions as this can take a
long time to load in some circumstances. Build loading screens into
Utils and SettingsPreferenceFragment so that it can be easily used
other places in the future.

Change-Id: I7febd06695487e02ced793a9fd418051b5f0eab8

src/com/android/settings/SettingsPreferenceFragment.java

@@ -158,6 +158,11 @@ public abstract class SettingsPreferenceFragment extends InstrumentedPreferenceF
         unregisterObserverIfNeeded();
     }
 
+    public void showLoadingWhenEmpty() {
+        View loading = getView().findViewById(R.id.loading_container);
+        getListView().setEmptyView(loading);
+    }
+
     public void registerObserverIfNeeded() {
         if (!mIsDataSetObserverRegistered) {
             if (mCurrentRootAdapter != null) {