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

chrome/android/java/chrome.xml

Index: chrome/android/java/chrome.xml
diff --git a/chrome/android/java/chrome.xml b/chrome/android/java/chrome.xml
new file mode 100644
index 0000000000000000000000000000000000000000..410af2307039dfea6fb21dc11f484deb1056cfb3
--- /dev/null
+++ b/chrome/android/java/chrome.xml
@@ -0,0 +1,19 @@
+<!--
+  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" default="dist" basedir=".">
+  <description>
+    Building chrome.jar from java source code.
+  </description>
+  <import file="../../../build/android/ant/chromium-jars.xml" />
+  <path id="javac.custom.classpath">
+    <pathelement location="${ANDROID_SDK}/android.jar" />
+    <pathelement location="${lib.dir}/chromium_content.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}" />
+</project>