fragileUserData-apps might keep data on uninstall

If an app declares that is has flagile user data, all the user to choose
to keep the app-data on uninstall.

Test: Unistalled apps that set the new flag and app that did not.
      Verified that the KEEP_DATA flag was set when checkbox was
      clicked.
Change-Id: I032fb21854352bbc175934ae5eb68a1430b1d403
Fixes: 117578306
diff --git a/packages/PackageInstaller/AndroidManifest.xml b/packages/PackageInstaller/AndroidManifest.xml
index 18b8662..591cf70 100644
--- a/packages/PackageInstaller/AndroidManifest.xml
+++ b/packages/PackageInstaller/AndroidManifest.xml
@@ -16,6 +16,7 @@
     <uses-permission android:name="android.permission.INTERACT_ACROSS_USERS_FULL" />
     <uses-permission android:name="android.permission.SUBSTITUTE_NOTIFICATION_APP_NAME" />
     <uses-permission android:name="android.permission.CLEAR_APP_USER_DATA" />
+    <uses-permission android:name="android.permission.PACKAGE_USAGE_STATS" />
 
     <uses-permission android:name="com.google.android.permission.INSTALL_WEARABLE_PACKAGES" />