Make apks be built in a consistent way

build/java_apk.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.
+
+# This file is meant to be included into a target to provide a rule
+# to build Android APKs in a consistent manner.
+#
+# To use this, create a gyp target with the following form:
+# {
+#   'target_name': 'my_package_apk',
+#   'type': 'none',
+#   'variables': {
+#     'package_name': 'my_package',
+#     'apk_name': 'MyPackage',
+#     'java_in_dir': 'path/to/package/root',
+#     'resource_dir': 'path/to/package/root/res',
+#   },
+#   'includes': ['path/to/this/gypi/file'],
+# }
+#
+# Note that this assumes that there's an ant buildfile <package_name>_apk.xml in
+# java_in_dir. So, if you have package_name="content_shell" and
+# java_in_dir="content/shell/android/java" you should have a directory structure
+# like:
+#
+# content/shell/android/java/content_shell_apk.xml
+# content/shell/android/java/src/chromium/base/Foo.java
+# content/shell/android/java/src/chromium/base/Bar.java
+
+{
+  'variables': {
+    'input_jars_paths': [],
+    'native_libs_paths': [],
+    'additional_src_dirs': [],
+    'additional_input_paths': [],
+  },
+  'actions': [
+    {
+      'action_name': 'ant_<(package_name)_apk',
+      'message': 'Building <(package_name) apk.',
+      'inputs': [
+        '<(java_in_dir)/<(package_name)_apk.xml',
+        '<(java_in_dir)/AndroidManifest.xml',
+        '<(DEPTH)/build/android/ant/common.xml',
+        '<(DEPTH)/build/android/ant/sdk-targets.xml',
+        '<!@(find <(java_in_dir) -name "*.java")',
+        '<!@(find <(resource_dir) -name "*")',
+        '>@(input_jars_paths)',
+        '>@(native_libs_paths)',
+        '>@(additional_input_paths)',
+      ],
+      'outputs': [
+        '<(PRODUCT_DIR)/<(package_name)/<(apk_name)-debug.apk',
+      ],
+      'action': [
+        'ant',
+        '-DPRODUCT_DIR=<(ant_build_out)',
+        '-DAPP_ABI=<(android_app_abi)',
+        '-DANDROID_GDBSERVER=<(android_gdbserver)',
+        '-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)',
+        '-DPACKAGE_NAME=<(package_name)',
+        '-DCONFIGURATION_NAME=<(CONFIGURATION_NAME)',
+        '-DINPUT_JARS_PATHS=>(input_jars_paths)',
+        '-DADDITIONAL_SRC_DIRS=>(additional_src_dirs)',
+        '-DRESOURCE_DIR=<(resource_dir)',
+        '-buildfile',
+        '<(java_in_dir)/<(package_name)_apk.xml'
+      ]
+    },
+  ],
+}