Add a test runner for android_webview.

android_webview/java/android_webview_apk.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Copyright (c) 2012 The Chromium Authors. All rights reserved.
+  Use of this source code is governed by a BSD-style license that can be
+  found in the LICENSE file.
+-->
+<project name="AndroidWebView" default="debug" basedir=".">
+  <description>
+    Building AndroidWebView.apk
+  </description>
+  <import file="../../build/android/ant/common.xml"/>
+  <import file="../../build/android/ant/sdk-targets.xml"/>
+  <property-value name="target.abi" value="${APP_ABI}"/>
+  <property-location name="out.dir" location="${PRODUCT_DIR}/android_webview"
+      check-exists="false"/>
+  <property name="resource.absolute.dir" value="../res"/>
+  <property name="gen.absolute.dir" value="${out.dir}/gen"/>
+  <property name="jar.libs.dir" value="${out.dir}/java/libs"/>
+  <property name="native.libs.absolute.dir" location="${out.dir}/libs"/>
+  <property name="asset.absolute.dir" location="${out.dir}/assets"/>
+
+  <path id="out.dex.jar.input.ref">
+    <fileset file="${out.dir}/java/libs/chromium_base.jar"/>
+    <fileset file="${out.dir}/java/libs/chromium_content.jar"/>
+    <fileset file="${out.dir}/java/libs/chromium_media.jar"/>
+    <fileset file="${out.dir}/java/libs/chromium_net.jar"/>
+    <fileset file="${out.dir}/java/libs/chromium_web_contents_delegate_android.jar"/>
+  </path>
+  <property name="java.compilerargs" value="-classpath ${toString:out.dex.jar.input.ref}"/>
+
+  <!-- We expect PRODUCT_DIR to be set like the gyp var (e.g. $ROOT/out/Debug) -->
+  <fail message="PRODUCT_DIR env var not set?">
+    <condition>
+      <not>
+        <isset property="PRODUCT_DIR"/>
+      </not>
+    </condition>
+  </fail>
+
+  <!-- Classpath for javac -->
+  <path id="javac.custom.classpath">
+    <path refid="out.dex.jar.input.ref"/>
+  </path>
+  <import file="${sdk.dir}/tools/ant/build.xml"/>
+</project>