Serialize the path() function with double quotes

Per https://drafts.csswg.org/cssom/#serialize-a-string double quotes
should be used when serializing strings.

Bug: 873527
Change-Id: I3b7a3c6425c6a5d0d6f96399663f5ae8b3929a59
Reviewed-on: https://chromium-review.googlesource.com/1213171
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589652}
14 files changed