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The incumbent realm schedules the currently-running callback although
it may not correspond to the currently-running function object.
The goal for this CL to is check whether the script setting is disabled
before invoking JS callback, then checking the context which originally
schedules the current-running callback seems to make more sense.

Please notice that this CL changes the behavior of the method
IsCallbackFunctionRunnable to require the execution context of the
incumbent environment to be not empty, not paused and enabled for
JavaScript.

Bug: 849600,849601,849730,848086,849915,851357
Change-Id: Id8ab0f9f67f9602635b295b414d2d0026c87e4ab
Reviewed-on: https://chromium-review.googlesource.com/1087536
Commit-Queue: Johnny Ding <jnd@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568799}