Add test jar generation logic for ant builds.

build/android/ant/chromium-jars.xml

 <!--
   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="chromium-jars" default="dist">
   <!--
     Common ant build file for for chromium_*.jars.
     For creating a new chromium_*.jar :
     1. Use build/java.gypi action.
@@ skipping 14 matching lines @@
   <path id="javac.srcdirs.additional">
     <filelist files="${ADDITIONAL_SRC_DIRS}" />
   </path>
 
   <property-value
     name="javac.srcdir"
     value="src:${toString:javac.srcdirs.additional}"
   />
 
   <property-location
-    name="lib.dir"
-    location="${PRODUCT_DIR}/lib.java"
-    check-exists="false"
-  />
-
-  <property-location
     name="dest.dir"
     location="${PRODUCT_DIR}/java/${PACKAGE_NAME}"
     check-exists="false"
   />
 
   <target name="init">
     <!-- Create the time stamp -->
     <tstamp/>
     <!-- Create the build directory structure used by compile -->
-    <mkdir dir="${lib.dir}"/>
     <mkdir dir="${dest.dir}"/>
 
     <!-- Remove all .class files from dest.dir. This prevents inclusion of
          incorrect .class files in the final .jar. For example, if a .java file
          was deleted, the .jar should not contain the .class files for that
          .java from previous builds.
     -->
     <delete>
       <fileset dir="${dest.dir}" includes="**/*.class"/>
     </delete>
@@ skipping 17 matching lines @@
       classpathref="javac.custom.classpath"
       debug="true"
       includeantruntime="false"
     />
   </target>
 
   <target name="dist" depends="compile"
       description="Generate chromium_${PACKAGE_NAME}.jar.">
     <!-- Create the distribution directory -->
     <jar
-      jarfile="${lib.dir}/chromium_${PACKAGE_NAME}.jar"
+      jarfile="${lib.java.dir}/chromium_${PACKAGE_NAME}.jar"
       basedir="${dest.dir}"
     />
 
     <!-- If Gyp thinks this output is stale but Ant doesn't, the modification
          time should still be updated. Otherwise, this target will continue to
          be rebuilt in future builds.
     -->
-    <touch file="${lib.dir}/chromium_${PACKAGE_NAME}.jar"/>
+    <touch file="${lib.java.dir}/chromium_${PACKAGE_NAME}.jar"/>
   </target>
 
   <target name="clean" description="clean up">
     <!-- Delete the appropriate directory trees -->
     <delete dir="${dest.dir}" />
   </target>
 </project>