Enforcement control for READ_EXTERNAL permission.

Surface enforcement controls for READ_EXTERNAL_STORAGE permission
using new PackageManager API.

Bug: 6131916
Change-Id: I0ece4742666fda58e41410cb4b0b7175f280fa31

res/menu/storage.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2012 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+    <item
+        android:id="@+id/storage_usb"
+        android:title="@string/storage_menu_usb" />
+    <item
+        android:id="@+id/storage_enforce_read_external"
+        android:title="@string/storage_menu_enforce_read_external"
+        android:checkable="true" />
+</menu>