Add circle background outline to unthethered icon

<?xml version="1.0" encoding="utf-8"?>

<!--

  Copyright (C) 2019 The Android Open Source Project

  Licensed under the Apache License, Version 2.0 (the "License");

  you may not use this file except in compliance with the License.

  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software

  distributed under the License is distributed on an "AS IS" BASIS,

  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  See the License for the specific language governing permissions and

  limitations under the License.

  -->

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:alpha="0.14"

          android:color="?android:attr/colorForeground"/>

</selector>

 No newline at end of file

<?xml version="1.0" encoding="utf-8"?>

<!--

  Copyright (C) 2019 The Android Open Source Project

  Licensed under the Apache License, Version 2.0 (the "License");

  you may not use this file except in compliance with the License.

  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software

  distributed under the License is distributed on an "AS IS" BASIS,

  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  See the License for the specific language governing permissions and

  limitations under the License.

  -->

<shape xmlns:android="http://schemas.android.com/apk/res/android"

       android:shape="oval">

    <stroke

        android:width="1dp"

        android:color="@color/circle_outline_color"/>

</shape>

        android:id="@+id/header_icon"

        android:layout_width="72dp"

        android:layout_height="72dp"

        android:scaleType="fitCenter"

        android:layout_gravity="center_horizontal"

        android:antialias="true"/>

        android:antialias="true"

        android:background="@drawable/circle_outline"

        android:padding="8dp"

        android:scaleType="fitCenter"/>

    <TextView

        android:id="@+id/header_title"