commit 143f24fc70141c38e74e17e8406eda0be24948f0
author Rakina Zata Amni <rakina@chromium.org> Mon Jul 09 06:43:51 2018
committer Commit Bot <commit-bot@chromium.org> Mon Jul 09 06:43:51 2018
tree 081ce74d00c2d6aae45e8f67f72a6a8d6fc2fde2
parent 1c05d59aa36f960c74f90c6433e5c43b3948c30d

Change CSSStyleSheet constructor to produce only empty CSSStyleSheets

We previously implemented constructable CSSStyleSheet synchronously,
but discussions in https://github.com/WICG/construct-stylesheets/issues/2
have gravitated away from that and we are now interested in asynchronous
creation of CSSStyleSheet, but also provide synchronous constructor that
only result in an empty sheet.

This CL changed the constructors to not accept CSS text. This also
changes part of the constructor where we process passed MediaList
data to copy the given MediaList instead of using the same instance
to avoid introducing the concept of mutable MediaLists.
See: https://github.com/WICG/construct-stylesheets/issues/13

CL for promise-based API: crrev.com/c/1126754

Bug: 807560
Change-Id: I0aeb052b63e45d81fc46cde3052f3d134afa16fa
Reviewed-on: https://chromium-review.googlesource.com/1126898
Reviewed-by: Fergal Daly <fergal@chromium.org>
Reviewed-by: Hayato Ito <hayato@chromium.org>
Reviewed-by: Takayoshi Kochi <kochi@chromium.org>
Commit-Queue: Rakina Zata Amni <rakina@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573233}