Bug 888618 - Part 1: Add Cell::tenuredIsInsideZone for threadsafe asserts. (r=billm)
Bug 888618 - Part 2: Make String post barriers take ThreadSafeContext. (r=terrence)
Bug 890968 - Part 1: Revert thread unsafe JSString methods to JSContext. (r=bhackett)
Bug 890968 - Part 2: Add nondestructive getChars to JSString. (r=bhackett)
Bug 890968 - Part 3: RAII wrapper for inspecting contents of JSStrings in a thread safe way. (r=nmatsakis)
Bug 877893 - Followup: add testcase. (r=me)