Add gwt_module() bucklet

Change-Id: I1bf6df6baba9dac7be1728913ccd95ffa8103502

gwt_module.bucklet

diff --git a/gwt_module.bucklet b/gwt_module.bucklet
new file mode 100644
index 0000000..d62c44a
--- /dev/null
+++ b/gwt_module.bucklet
@@ -0,0 +1,29 @@
+# Copyright (C) 2014 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# This bucklet simplifies creation of GWT modules.
+
+import copy
+
+def gwt_module(
+    gwt_xml = None,
+    **kwargs):
+  kw = copy.deepcopy(kwargs)
+  if 'resources' not in kw:
+    kw['resources'] = []
+  if gwt_xml:
+    kw['resources'] += [gwt_xml]
+  if 'srcs' in kw:
+    kw['resources'] += kw['srcs']
+  java_library(**kw)