MDC-Android type theme attributes

mdc_type_theme_attrs.xml

<!-- Copyright 2020 Google LLC.
   SPDX-License-Identifier: Apache-2.0 -->

<!-- In res/values/themes.xml -->
<style name="Theme.App.Base" parent="Theme.MaterialComponents.*">
    ...
    <item name="textAppearanceHeadline6">
        @style/TextAppearance.App.Headline6
    </item>
    <item name="textAppearanceBody2">
        @style/TextAppearance.App.Body2
    </item>
    <item name="textAppearanceButton">
        @style/TextAppearance.App.Button
    </item>
    <!-- Using default values for textAppearanceSubtitle1, textAppearanceCaption, etc. -->
</style>