Add controllers for iinstant app related preferences.

For AppInfoDashboardFragment:
- add app installer preference into the preference screen
instead of creating it dynamically.
- add controller for the App Installer, Instant App buttons, and instant
app domains preferences.

Bug: 69384089
Test: make RunSettingsRoboTests
Change-Id: I8d362cacb78077c173130018c33c4d00abfe9843

src/com/android/settings/applications/AppStoreUtil.java

@@ -16,11 +16,9 @@
 
 package com.android.settings.applications;
 
-
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.ResolveInfo;
-import android.net.Uri;
 import android.util.Log;
 
 // This class provides methods that help dealing with app stores.
@@ -43,9 +41,6 @@ public class AppStoreUtil {
         } catch (IllegalArgumentException e) {
             Log.e(LOG_TAG, "Exception while retrieving the package installer of " + packageName, e);
         }
-        if (installerPackageName == null) {
-            return null;
-        }
         return installerPackageName;
     }