Add permission required for eml viewer to save attachments

b/11437237

Change-Id: I55b9d70c9b5e02d58151b4e678aa09348f921b63
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 62313d1..7baa557 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -37,6 +37,7 @@
     <uses-permission android:name="android.permission.NFC"/>
     <uses-permission android:name="android.permission.WAKE_LOCK"/>
     <uses-permission android:name="android.permission.READ_PHONE_STATE"/>
+    <uses-permission android:name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION" />
 
     <!-- This needs to be present when we are doing unbundled releases. -->
     <uses-sdk android:targetSdkVersion="18" android:minSdkVersion="14" />