Something mysterious happened about 25 days ago with Bazel HEAD. It caused Closure Rules' Travis CI tests to go from taking 15 minutes to 45 minutes.

Travis builds at HEAD are also very frequently failing, because Travis is kill 9'ing Bazel process. Probably due to exceeding memory.

Here's the build history:

https://travis-ci.org/bazelbuild/rules_closure/builds