chromium/chrome/android/features/tab_ui/java/res/layout/tab_strip_item.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
Copyright 2019 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<org.chromium.ui.widget.ViewLookupCachingFrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">
    <ImageButton
        android:id="@+id/tab_strip_item_button"
        style="@style/BottomToolbarButton"
        android:contentDescription="@string/accessibility_tabstrip_btn_close_tab" />
    <!-- This ImageView represents a notification dot on the upper right
    hand corner of the tab strip icon view. Following precedence with
    the close tab button above, it should not conform to RTL policies. -->
    <ImageView
        android:id="@+id/tab_strip_notification_bubble"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="top|right"
        android:layout_marginTop="7dp"
        android:layout_marginRight="8dp"
        android:visibility="gone"
        android:importantForAccessibility="no"
        android:src="@drawable/tab_strip_item_notification_bubble"
        tools:ignore="RtlHardcoded" />
</org.chromium.ui.widget.ViewLookupCachingFrameLayout>