Update the cronet sample app with new async APIs.

components/cronet/android/sample/res/layout/activity_main.xml

Index: components/cronet/android/sample/res/layout/activity_main.xml
diff --git a/components/cronet/android/sample/res/layout/activity_main.xml b/components/cronet/android/sample/res/layout/activity_main.xml
new file mode 100644
index 0000000000000000000000000000000000000000..546414f5bb1c3b5980cf57be921cc04aae153b87
--- /dev/null
+++ b/components/cronet/android/sample/res/layout/activity_main.xml
@@ -0,0 +1,21 @@
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools" 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=".CronetSampleActivity">
+
+    <TextView
+        android:id="@+id/resultView"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_centerHorizontal="true" />
+
+    <TextView
+        android:id="@+id/dataView"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="26dp"
+        android:layout_below="@id/resultView" />
+
+</RelativeLayout>