Add test jar generation logic for ant builds.

build/android/ant/sdk-targets.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_sdk_overrides" >
   <!--
     Redefinition of targets used by SDK tools.
     Supported version: SDK tools revision 20.
 
     SDK tools do not allow easy way of extending classpaths
     for aidl and javac. This file defines targets which can be used to
     override targets used by tools.
   -->
-
   <!--
     Override the -compile target.
     This target requires 'javac.custom.classpath' to be set to reference
     of classpath to be used for javac. Also accepts custom path for
     sources: 'javac.custom.sourcepath'.
   -->
   <target
       name="-compile"
       depends="-build-setup, -pre-build, -code-gen, -pre-compile">
     <do-only-if-manifest-hasCode elseText="hasCode = false. Skipping..." >
@@ skipping 58 matching lines @@
                 metadatafile="${emma.coverage.absolute.file}"
                 mode="overwrite"
                 outdir="${out.absolute.dir}/classes"
                 verbosity="${verbosity}">
               <filter excludes="${emma.default.filter}"/>
               <filter value="${emma.filter}"/>
             </instr>
           </emma>
         </then>
       </if>
+      <!-- if the project needs a test jar then generate a jar containing

[Yaron, 2012/09/07 19:19:31]

Nit: Start comment on next line and capitalize.

+           all compiled classes and referenced jars.
+      -->
+      <if condition="${generate.test.jar}">
+        <then>
+          <echo level="info">Creating test jar file...</echo>

[Yaron, 2012/09/07 19:19:31]

Include the property in the description so we can see which one is being
generated

+          <property-location name="create.test.jar.file"
+            location="${CHROMIUM_SRC}/build/android/ant/create-test-jar.js" />

[Yaron, 2012/09/07 19:19:31]

indent 4. Please also remove trailing spaces before the "/>" throughout your
change

+          <script language="javascript" src="${create.test.jar.file}" />
+        </then>
+      </if>
+
     </do-only-if-manifest-hasCode>
   </target>
 </project>