Add animatable flag to CSSProperties.in

Source/build/scripts/make_css_property_metadata.py

+#!/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.
+
+import sys
+
+import css_properties
+import in_generator
+import template_expander
+
+
+class CSSPropertyMetadataWriter(css_properties.CSSProperties):
+    def __init__(self, in_file_path):
+        super(CSSPropertyMetadataWriter, self).__init__(in_file_path)
+        self._outputs = {'CSSPropertyMetadata.cpp': self.generate_css_property_metadata_cpp}
+
+    @template_expander.use_jinja('CSSPropertyMetadata.cpp.tmpl')
+    def generate_css_property_metadata_cpp(self):
+        return {
+            'properties': self._properties,
+        }
+
+
+if __name__ == '__main__':
+    in_generator.Maker(CSSPropertyMetadataWriter).main(sys.argv)