chromium/chrome/browser/tab_ui/android/java/res/drawable/ic_tab_placeholder.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2023 The Chromium Authors
     Use of this source code is governed by a BSD-style license that can be
     found in the LICENSE file. -->

<vector
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:width="64dp"
  android:height="64dp"
  android:viewportWidth="68"
  android:viewportHeight="68"
  android:tint="@macro/default_icon_color">
  <group>
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  </group>
  <path
    android:fillColor="@android:color/transparent"
    android:pathData="M34,34m-32.063,0a32.063,32.063 0,1 1,64.125 0a32.063,32.063 0,1 1,-64.125 0"
    android:strokeColor="@android:color/black"
    android:strokeWidth="3.375"/>
</vector>