Generate enum/getters/setters/mappings for isolation.
Currently, the isolation property is a 'storage_only' field, so it has
no generated public getters/setters.
This patch changes it to a 'keyword' field so that its getters/setters
can be generated as well. We also generate the EIsolation enum and
use the generated CSSValueID <-> EIsolation mappings.
Diff: https://gist.github.com/3920a62cb3b9844256b997d6a4e06672/revisions
BUG=628043
Review-Url: https://codereview.chromium.org/2941623004
Cr-Commit-Position: refs/heads/master@{#479352}
4 files changed
