Add number of enterprise-installed apps to Privacy Settings page

This CL adds information about the number of apps that were installed
by the admin to the Enterprise Privacy Settings page.

Test: make RunSettingsRoboTests
Bug: 32692748

Change-Id: Ib710a1249db6d285da962122fd3dfb35a43752a1

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

@@ -20,6 +20,7 @@ import android.content.Intent;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
+import android.os.UserHandle;
 
 import java.util.List;
 
@@ -56,4 +57,12 @@ public interface PackageManagerWrapper {
      * @see android.content.pm.PackageManager#queryIntentActivitiesAsUser
      */
     List<ResolveInfo> queryIntentActivitiesAsUser(Intent intent, int flags, int userId);
+
+
+    /**
+     * Calls {@code PackageManager.getInstallReason()}.
+     *
+     * @see android.content.pm.PackageManager#getInstallReason
+     */
+    int getInstallReason(String packageName, UserHandle user);
 }