Add android_library template

build/android/gyp/write_build_config.py

Index: build/android/gyp/write_build_config.py
diff --git a/build/android/gyp/write_build_config.py b/build/android/gyp/write_build_config.py
new file mode 100755
index 0000000000000000000000000000000000000000..ff12a1ed7ca4641141787987ec4611fcb4b9d9f9
--- /dev/null
+++ b/build/android/gyp/write_build_config.py
@@ -0,0 +1,94 @@
+#!/usr/bin/env python
+#
+# Copyright 2014 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.
+
+"""Writes a build_config file.
+
+The build_config file for a target is a json file containing information about
+how to build that target based on the target's dependencies. This includes
+things like: the javac classpath, the list of android resources dependencies,
+etc. It also includes the information needed to create the build_config for
+other target's that depend on that one.
+
+There are several different types of build_configs:
+  android_library: An android library containing java code.
+
+Android build scripts should not refer to the build_config directly, and the
+build specification should instead pass information in using the special
+file-arg syntax (see build_utils.py:ExpandFileArgs). That syntax allows passing
+of values in a json dict in a file and looks like this:
+  --python-arg=@(build_config_path):javac:classpath
+
+Note: If paths to input files are passed in this way, it is important that:
+  1. inputs/deps of the action ensure that the files are available the first
+  time the action runs.
+  2. Either (a) or (b)
+    a. inputs/deps ensure that the action runs whenever one of the files changes
+    b. the files are added to the action's depfile
+"""
+
+import optparse
+import os
+import sys
+
+from util import build_utils
+
+def main(argv):
+  parser = optparse.OptionParser()
+  build_utils.AddDepfileOption(parser)
+  parser.add_option('--build-config', help='Path to build_config output.')
+  parser.add_option('--type', help='Type of this target.')
+  parser.add_option(
+      '--possible-deps-configs',
+      help='List of paths for dependency\'s build_config files. Some '
+      'dependencies may not write build_config files. Missing build_config '
+      'files are handled differently based on the type of this target.')
+
+  # android_library options
+  parser.add_option('--jar-path', help='Path to target\'s jar output.')
+
+  options, args = parser.parse_args(argv)
+
+  if args:
+    parser.error('No positional arguments should be given.')
+
+  required_options = ('build_config', 'type')
+  build_utils.CheckOptions(options, parser, required_options)
+
+  if options.type == 'android_library':
+    required_options = ('jar_path',)
+    build_utils.CheckOptions(options, parser, required_options)
+
+  deps_configs = build_utils.ParseGypList(options.possible_deps_configs)
+  for c in deps_configs:
+    if not os.path.exists(c):
+      # Currently we only allow deps to things that write build_config files.
+      raise Exception('Unknown dep type: ' + c)
+
+  deps_configs = [build_utils.ReadJson(c) for c in deps_configs]
+
+  if options.type == 'android_library':
+    javac_classpath = [c['outputs']['jar_path'] for c in deps_configs]
+    config = {
+      'outputs': {
+        'jar_path': options.jar_path
+      },
+      'javac': {
+        'classpath': javac_classpath
+      }
+    }
+  else:
+    raise Exception('Unknown type: ' + options.type)
+
+  build_utils.WriteJson(config, options.build_config)
+
+  if options.depfile:
+    build_utils.WriteDepfile(
+        options.depfile,
+        build_utils.GetPythonDependencies())
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv[1:]))