This is a reland of 98dec8f2

Original change's description:
> [inspector] added Runtime.terminateExecution
> 
> Runtime.terminateExecution terminates current or next JavaScript
> call. Termination flag is automatically reset as soon as v8 call
> or microtasks are completed.
> 
> R=pfeldman@chromium.org
> 
> Bug: chromium:820640
> Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
> Change-Id: Ie21c123be3a61fe25cf6e04c38a8b6c664622ed7
> Reviewed-on: https://chromium-review.googlesource.com/957386
> Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
> Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#51912}

Bug: chromium:820640
Change-Id: I8f270c2fdbe732f0c40bfb149d26a6e73d988253
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Reviewed-on: https://chromium-review.googlesource.com/966681Reviewed-by: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52002}