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

content/content_shell.gypi

 # 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': {
     'content_shell_product_name': 'Content Shell',
   },
   'targets': [
     {
@@ skipping 629 matching lines @@
                 '<(PRODUCT_DIR)/content_shell/ContentShell-debug.apk',
               ],
               'action': [
                 # Pass the build type to ant. Currently it only assumes
                 # debug mode in java. Release mode will break the current
                 # workflow.
                 # 'shell/content_shell_ant_helper.sh',
                 'ant',
                 '-DPRODUCT_DIR=<(ant_build_out)',
                 '-DAPP_ABI=<(android_app_abi)',
+                '-DANDROID_SDK=<(android_sdk)',
+                '-DANDROID_SDK_ROOT=<(android_sdk_root)',
+                '-DANDROID_SDK_TOOLS=<(android_sdk_tools)',
+                '-DANDROID_SDK_VERSION=<(android_sdk_version)',
+                '-DANDROID_TOOLCHAIN=<(android_toolchain)',
                 '-buildfile',
                 'shell/android/java/content_shell_apk.xml',
                 # '<(CONFIGURATION_NAME)',
               ],
               'dependencies': [
                 'content_java',
               ],
             }
           ],
         },
       ],
     }],  # OS=="android"
   ]
 }