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We add a new private API for Chrome OS component extensions to report
JavaScript errors to Crash. The API mirrors the window.onerror API.

Design doc:
https://docs.google.com/document/d/1XqN_wO1_UfVRTfhDf6yzHCyBwq_TcSw8ILDOOY_h3w4/edit?usp=sharing

Bug: 986178
Change-Id: I8e11553fd7d1c07c712c7a87a68f1c0ccace54f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1732329
Commit-Queue: Darren Shen <shend@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Chris Palmer <palmer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719493}