Fix launcher3 standalone build.

Change-Id: Ibfe14c5960211916222fc49389b8776be6bf768b
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 14fb044..c6263fb 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -61,6 +61,7 @@
     <uses-permission android:name="android.permission.VIBRATE" />
     <uses-permission android:name="android.permission.BIND_APPWIDGET" />
     <uses-permission android:name="android.permission.GET_ACCOUNTS" />
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
     <uses-permission android:name="com.android.launcher.permission.READ_SETTINGS" />
     <uses-permission android:name="com.android.launcher.permission.WRITE_SETTINGS" />
     <uses-permission android:name="com.android.launcher3.permission.READ_SETTINGS" />