This gives host have more control for running jsc test on remote device
<rdar://problem/116938793>
Pull request: https://github.com/WebKit/WebKit/pull/19072
We need a mechanism for the jsc shell runner can be paused. This is specially needed when running the jsc shell runner on an embedded device, which is battery powered. With this mechanism, we can easily to pause the running when we need the device to charge. Otherwise we are in a risk that the device won't have enough battery to finish all the tests.
Committed 270606@main (eec858ecd19f): <https://commits.webkit.org/270606@main> Reviewed commits have been landed. Closing PR #19072 and removing active labels.