Add test jar generation logic for ant builds.

build/android/ant/common.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="chrome_common_defines">
   <!-- Common build properties for Chrome for android. -->
 
   <!--
@@ skipping 57 matching lines @@
       <property name="@{name}" value="@{value}"/>
       <check-property-value property="@{name}"/>
     </sequential>
   </macrodef>
 
   <!-- Common environment properties. -->
   <property-location name="sdk.dir" location="${ANDROID_SDK_ROOT}"/>
   <property-value name="target" value="android-${ANDROID_SDK_VERSION}"/>
   <property name="source.dir" location="src"/>
   <property-location name="android.gdbserver" location="${ANDROID_GDBSERVER}"/>
+  <!--
+       Common directories used by SDK Build, when making changes here
+       make sure to update gyp files and test scripts constants in
+       build/android/pylib/constants.py
+  -->
+  <!-- Common directory for chromium_*.jars. -->
+  <property-location name="lib.java.dir" location="${PRODUCT_DIR}/lib.java"/>
+  <!-- Common directory for test jars. -->
+  <property-location name="test.lib.java.dir"
+    location="${PRODUCT_DIR}/test.lib.java"/>
+  <!-- Common directory for apks. -->
+  <property-location name="apks.dir" location="${PRODUCT_DIR}/apks"/>
 </project>