Update the cronet sample app with new async APIs.

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

Index: components/cronet/android/sample/res/layout/dialog_url.xml
diff --git a/components/cronet/android/sample/res/layout/dialog_url.xml b/components/cronet/android/sample/res/layout/dialog_url.xml
new file mode 100644
index 0000000000000000000000000000000000000000..29cf9c66bf03ad679a0a7718a71abbf178917fb4
--- /dev/null
+++ b/components/cronet/android/sample/res/layout/dialog_url.xml
@@ -0,0 +1,36 @@
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content">
+
+    <TextView
+        android:id="@+id/urlView"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="6dp"
+        android:layout_marginStart="4dp"
+        android:textSize="16sp"
+        android:text="@string/urlText" />
+
+    <EditText
+        android:id="@+id/urlText"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:inputType="textUri" />
+
+    <TextView
+        android:id="@+id/postView"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="26dp"
+        android:layout_marginStart="4dp"
+        android:textSize="16sp"
+        android:text="@string/postText" />
+
+    <EditText
+        android:id="@+id/postText"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:inputType="text" />
+
+</LinearLayout>