android/WALT/app/src/main/res/layout/fragment_screen_response.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:walt="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="org.chromium.latency.walt.TapLatencyFragment">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <RelativeLayout
            android:id="@+id/button_bar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">

            <ImageButton
                android:id="@+id/button_stop_screen_response"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentLeft="true"
                android:tint="@color/button_tint"
                android:src="@drawable/ic_stop_black_24dp" />

            <ImageButton
                android:id="@+id/button_start_screen_response"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentRight="true"
                android:tint="@color/button_tint"
                android:src="@drawable/ic_play_arrow_black_24dp" />

            <Spinner
                android:id="@+id/spinner_screen_response"
                android:layout_height="45dp"
                android:layout_width="fill_parent"
                android:layout_toRightOf="@id/button_stop_screen_response"
                android:layout_toLeftOf="@id/button_start_screen_response"
                android:prompt="@string/screen_response_mode"/>
        </RelativeLayout>

        <include
            android:id="@+id/brightness_chart_layout"
            layout="@layout/line_chart" />

        <org.chromium.latency.walt.HistogramChart
            android:id="@+id/latency_chart"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:visibility="gone"
            walt:description="Blink Latency [ms]"
            walt:numDataSets="2"
            walt:binWidth="5" />

        <!-- The big box that flickers between black and white -->
        <TextView
            android:id="@+id/txt_black_box_screen"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="2"
            android:background="#aaaaaa"
            android:gravity="bottom"
            android:scrollbars="vertical" />

        <org.chromium.latency.walt.FastPathSurfaceView
            android:id="@+id/fast_path_surface"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="2"
            android:visibility="gone" />

    </LinearLayout>
</FrameLayout>