Add INTERACT_ACROSS_USERS permission for DocsUI AndroidManifest

Test: make aosp_x86_64-eng
Test: make flame-userdebug
Test: check INTERACT_ACROSS_USERS in /system/etc/permissions/com.android.documentsui.xml
Test: check INTERACT_ACROSS_USERS grant to DocumentsUI.apk
Test: atest DocumentsUITests:com.android.documentsui.PermissionsTest
Bug: 148198996

Change-Id: I99b7efee67d5d452fd64f29d436d65b8a04cf100
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index f467b0e..c5de57c 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -26,6 +26,7 @@
     <uses-permission android:name="android.permission.CACHE_CONTENT" />
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
     <uses-permission android:name="android.permission.CHANGE_OVERLAY_PACKAGES" />
+    <uses-permission android:name="android.permission.INTERACT_ACROSS_USERS" />
 
     <application
         android:name=".DocumentsApplication"
diff --git a/tests/functional/com/android/documentsui/PermissionsTest.java b/tests/functional/com/android/documentsui/PermissionsTest.java
new file mode 100644
index 0000000..d03aeeb
--- /dev/null
+++ b/tests/functional/com/android/documentsui/PermissionsTest.java
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2020 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.
+ */
+
+package com.android.documentsui;
+
+import android.Manifest;
+import android.content.pm.PackageManager;
+
+import com.android.documentsui.files.FilesActivity;
+
+import org.junit.Test;
+
+public class PermissionsTest extends ActivityTest<FilesActivity> {
+
+    private static final String TAG = "PermissionsTest";
+
+    public PermissionsTest() {
+        super(FilesActivity.class);
+    }
+
+    @Override
+    public void setUp() throws Exception {
+        super.setUp();
+    }
+
+    @Test
+    public void testPermissionGranted_interactAcrossUsers() {
+        assertEquals(PackageManager.PERMISSION_GRANTED,
+                context.checkSelfPermission(Manifest.permission.INTERACT_ACROSS_USERS));
+    }
+}