am 4841c445: Merge "Add missing background behind account header" into lmp-dev

<!-- Layout showing the type of account filter

     (e.g. All contacts filter, custom filter, etc.),

     which is the header of all contact lists. -->

<LinearLayout

<!-- Solely used to set a background color -->

<FrameLayout

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

    android:layout_width="match_parent"

    android:layout_height="wrap_content"

    android:background="@color/background_primary">

    <!-- Used to show the touch feedback -->

    <FrameLayout

        android:id="@+id/account_filter_header_container"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

    android:orientation="vertical"

        android:paddingTop="@dimen/list_header_extra_top_padding"

    android:layout_marginLeft="@dimen/contact_browser_list_header_left_margin"

    android:layout_marginRight="@dimen/contact_browser_list_header_right_margin"

        android:layout_marginStart="@dimen/contact_browser_list_header_left_margin"

        android:layout_marginEnd="@dimen/contact_browser_list_header_right_margin"

        android:background="?android:attr/selectableItemBackground"

        android:visibility="gone">

        <!-- Shows the text and underlining -->

        <TextView

            android:id="@+id/account_filter_header"

            style="@style/ContactListSeparatorTextViewStyle"

            android:paddingLeft="@dimen/contact_browser_list_item_text_indent"

            android:paddingStart="@dimen/contact_browser_list_item_text_indent" />

</LinearLayout>

    </FrameLayout>

</FrameLayout>

    <!-- Shown only when an Account filter is set.

         - paddingTop should be here to show "shade" effect correctly. -->

    <include

        android:id="@+id/account_filter_header_container"

        layout="@layout/account_filter_header" />

    <include layout="@layout/account_filter_header" />

    <FrameLayout

        android:layout_width="match_parent"