chrome/android/testshell/res/xml/syncadapter.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- The attributes in this XML file provide configuration information -->
<!-- for the SyncAdapter. -->

<sync-adapter xmlns:android="http://schemas.android.com/apk/res/android"
    android:contentAuthority="org.chromium.chrome.testshell"
    android:accountType="com.google"
/>