[Android] Add chrome_java target for building Java code in the chromium layer.

content/public/android/java/content.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.
+<!--
+  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="Content" default="dist" basedir=".">
   <description>
     building content java source code with ant
   </description>
-  <!-- set global properties for this build -->
-  <property name="src" location="src"/>
-  <property name="out.dir" location="${PRODUCT_DIR}/lib.java"/>
-  <property name="classes.dir" location="${PRODUCT_DIR}/java/${PACKAGE_NAME}"/>
-  <property name="jar.dir" location="${out.dir}"/>
+  <import file="../../../../build/android/ant/chromium-jars.xml" />
 
-  <target name="init">
-    <!-- Create the time stamp -->
-    <tstamp/>
-    <!-- Create the build directory structure used by compile -->
-    <mkdir dir="${out.dir}"/>
-  </target>
-
-  <target name="compile" depends="init"
-          description="compile the source " >
-    <!-- Create the classes output directory -->
-    <mkdir dir="${classes.dir}"/>
-
-    <!-- Compile the java code from ${src} into ${classes.dir} -->
-    <!-- Gyp target should have compiled aidl files into java source files in
-         lib.jar (see content.gyp:common_aidl). -->
-    <javac srcdir="${src}:${out.dir}" destdir="${classes.dir}" debug="true" includeantruntime="false">
-      <classpath>
-        <pathelement path="${ANDROID_SDK}/android.jar" />
-        <pathelement path="${jar.dir}/chromium_base.jar" />
-        <pathelement path="${jar.dir}/chromium_net.jar" />
-      </classpath>
-    </javac>
-  </target>
-
-  <target name="dist" depends="compile"
-          description="generate the distribution" >
-    <!-- Create the distribution directory -->
-    <mkdir dir="${jar.dir}"/>
-
-    <!-- Put everything in ${classes.dir} into the chromium_content.jar file -->
-    <jar jarfile="${jar.dir}/chromium_${PACKAGE_NAME}.jar" basedir="${classes.dir}"/>
-  </target>
-
-  <target name="clean" description="clean up" >
-    <!-- Delete the generated content -->
-    <delete dir="${classes.dir}"/>
-    <delete file="${jar.dir}/chromium_${PACKAGE_NAME}.jar"/>
-  </target>
+  <path id="javac.custom.classpath">
+    <pathelement location="${ANDROID_SDK}/android.jar" />
+    <pathelement location="${lib.dir}/chromium_base.jar" />
+    <pathelement location="${lib.dir}/chromium_net.jar" />
+  </path>
+  <!-- Override javac path to include jars in lib.java directory -->
+  <property-value name="javac.srcdir" value="${src}:${lib.dir}" />
 </project>