res/drawable/ic_keyboard_shift.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2014 Google Inc. All Rights Reserved. -->
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:drawable="@drawable/ic_tab_on_tint_accent"
        android:state_checked="true" />
    <item
        android:drawable="@drawable/ic_tab_off_tint" />
</selector>