lawnchair/quickstep/res/drawable/gesture_tutorial_back_step_shape.xml

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<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="83dp"
    android:height="208dp"
    android:viewportWidth="83"
    android:viewportHeight="208"
    android:autoMirrored="true">
  <path
      android:pathData="M23.53,169.2L31.09,165.56C76.7,143.55 76.7,64.45 31.09,42.35L23.53,38.71C13.55,33.95 5.06,25.56 -1,14.92V193.08C5.06,182.44 13.55,174.05 23.53,169.2Z"
      android:fillColor="?attr/onSurfaceBack"/>
</vector>