Separating these runnables out under a separate subclass will let us delay their
delivery while the content window is paused in the debugger.
CancelingOnParentRunnable, used when the worker calls self.close(), to close the
worker from the parent thread, must also be a WorkerDebuggeeRunnable, since it
must be processed only after all prior messages/errors from the worker.
Depends on D9218
Differential Revision: https://phabricator.services.mozilla.com/D9219
--HG--
extra : moz-landing-system : lando
Sylvestre Ledru
Jim Blandy
Andrea Marchesini