Pull web-animations-js into third-party via the third_party/polymer/reproduce.sh script. Add necess…

third_party/polymer/reproduce.sh

Index: third_party/polymer/reproduce.sh
diff --git a/third_party/polymer/reproduce.sh b/third_party/polymer/reproduce.sh
index 4029e0c28c03a1c8cc5e29236038fb35c37cf2b1..ec1ebff9d0a98e3084aefb8dcd1cc87701faa23f 100755
--- a/third_party/polymer/reproduce.sh
+++ b/third_party/polymer/reproduce.sh
@@ -14,9 +14,19 @@ set -e
 cd "$(dirname "$0")"
 
 rm -rf components components-chromium
+rm -rf ../web-animations-js/sources
 
 bower install
 
+rm -rf components/web-animations-js/{test,node_modules}
+# TODO(jlklein): Remove when
+# https://github.com/web-animations/web-animations-next/pull/289 is released
+# and the version of web-animations-js is bumped in bower.json.
+rm components/web-animations-js/.travis-setup.sh
+
+mv components/web-animations-js ../web-animations-js/sources
+cp ../web-animations-js/sources/COPYING ../web-animations-js/LICENSE
+
 # These components are deprecated or needed only for demos.
 rm -rf components/{core-component-page,core-field,font-roboto,webcomponentsjs}