DevTools: introduce Target.targetCrashed(status)
DevTools: introduce Target.targetCrashed(status)

Change-Id: Iffc1f274cdbd7c294159d57ccd33220718f99b3d
Reviewed-on: https://chromium-review.googlesource.com/1081652
Commit-Queue: Pavel Feldman <e1161d7019a0d5c7981e3c3ffc69c76f4b09679a@chromium.org>
Reviewed-by: Dmitry Gozman <0ca14b32cbb359a30ac562af27dd84cc2813eacb@chromium.org>
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#563542}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 75746f8955aadc5e61506b2605bc7d2fe199e21c
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