commit 058930e68573f2dd66725d0145277af89f35a576
author Kevin McNee <mcnee@chromium.org> Thu Nov 29 16:59:07 2018
committer Commit Bot <commit-bot@chromium.org> Thu Nov 29 16:59:07 2018
tree 84e3791734997b8318c6f8df97d6b0c67e46033f
parent bb4a2135cb8f2d6e393d162efa94031eea7b93a5

Close the GuestView shadow root

Now that we're using Shadow DOM v1, we have the option to make the
shadow DOM unreachable by outside script by specifying a closed
encapsulation mode. Now GuestViews will behave more like other
elements defined by the browser which internally use shadow DOM.
This also prevents script from interfering with our internal elements
and producing unexpected behaviour.

Bug: 892886, 803274
Change-Id: I57b2513e3ff7290e286b3d8391e7d93bac2bc4e9
Reviewed-on: https://chromium-review.googlesource.com/c/1342768
Commit-Queue: Kevin McNee <mcnee@chromium.org>
Reviewed-by: Ehsan Karamad <ekaramad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612232}