servo/servo — pull request #3693 by ehsan (2014-10-16 02:05:06+00:00)
Title: Throw DataCloneError from worker postMessage if structured clone fails

This fixes #3248.

r? @jdm. Please review for mistakes mercilessly! Also, I got a host of test failures when running the worker tests, not sure if these tests are expected to pass locally or not.