packages/SystemUI/res/drawable/ic_signal_wifi_transient_animation.xml

<?xml version="1.0" encoding="utf-8"?>
<animated-vector
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:drawable="@drawable/ic_signal_wifi_transient" >
    <target
        android:name="wifi_1"
        android:animation="@anim/ic_signal_wifi_transient_wifi_1_animation" />
</animated-vector>