Add network tester client [android]

webrtc/tools/network_tester/androidapp/res/layout/activity_main.xml

Index: webrtc/tools/network_tester/androidapp/res/layout/activity_main.xml
diff --git a/webrtc/tools/network_tester/androidapp/res/layout/activity_main.xml b/webrtc/tools/network_tester/androidapp/res/layout/activity_main.xml
new file mode 100755
index 0000000000000000000000000000000000000000..8839a31003be5040dd70da8f89179b064d5dc171
--- /dev/null
+++ b/webrtc/tools/network_tester/androidapp/res/layout/activity_main.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/activity_main"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:paddingStart="@dimen/activity_horizontal_margin"
+    android:paddingEnd="@dimen/activity_horizontal_margin"
+    android:paddingTop="@dimen/activity_vertical_margin"
+    android:paddingBottom="@dimen/activity_vertical_margin"
+    tools:context="com.google.media.networktester.MainActivity">
+    <Button
+      android:text="@string/start_test"
+      android:layout_width="wrap_content"
+      android:layout_height="wrap_content"
+      android:layout_alignParentTop="true"
+      android:layout_alignParentStart="true"
+      android:id="@+id/start_button"/>
+    <Button
+      android:text="@string/interrupt_test"
+      android:layout_width="wrap_content"
+      android:layout_height="wrap_content"
+      android:layout_alignParentTop="true"
+      android:layout_toEndOf="@+id/start_button"
+      android:id="@+id/stop_button"/>
+
+</RelativeLayout>