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

chrome/chrome.gyp

 # 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.
 {
   'variables': {
     'chromium_code': 1,
 
     'variables': {
       'version_py_path': 'tools/build/version.py',
       'version_path': 'VERSION',
@@ skipping 1055 matching lines @@
             'safe_browsing_proto',
           ],
           'sources': [
             'browser/safe_browsing/signature_util.h',
             'browser/safe_browsing/signature_util_win.cc',
             'tools/safe_browsing/sb_sigutil.cc',
           ],
         },
       ]},  # 'targets'
     ],  # OS=="win"
+    ['OS=="android"',
+      {
+      'targets': [
+        {
+          'target_name': 'chrome_java',
+          'type': 'none',
+          'dependencies': [
+            '../base/base.gyp:base_java',
+            '../content/content.gyp:content_java',
+            '../net/net.gyp:net_java',
+          ],
+          'variables': {
+            'package_name': 'chrome',
+            'java_in_dir': '../chrome/android/java',
+          },
+          'includes': [ '../build/java.gypi' ],
+        },
+      ]}, # 'targets'
+    ],  # OS=="android"
   ],  # 'conditions'
 }