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This CL introduces chrome.dom.openOrClosedShadowRoot that is a
read-only property to allow access to the closed shadow root in
the Extension's content script.

Bug: 778816
Change-Id: I933bc5d3996a74f46ee75181c535150901a5a46a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2319951
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Mason Freed <masonfreed@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809277}