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This CL imports the async-local-storage implementation as-is
except for renaming to index.js.

Original author:
    Domenic Denicola (domenic@chromium.org)
https://github.com/domenic/async-local-storage

All code were written and contributed by Googlers
who are Chromium Contributors.

Tentatively this CL imports the files under core/script/resources
until a long-term plan for repository location etc. is settled.

This is a still experimental feature behind a flag, and its
API interface and implementation can be changed significantly
before shipped.

This CL also imports a test with some modifications.

Change-Id: I99944c75240ab2f1d114aa85f5c8ffac1f5e9b98
Reviewed-on: https://chromium-review.googlesource.com/1033713
Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555967}