Generate enum/getters/setters/mappings for text-combine-upright.
Currently, the text-combine-upright/{webkit,epub}-combine 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 ETextCombine enum and
use the generated CSSValueID <-> ETextCombine mappings.
Diff: https://gist.github.com/nainar/c2f36a25584d2f298ab9090fe308c6e5/revisions
BUG=628043
Review-Url: https://codereview.chromium.org/2916523002
Cr-Commit-Position: refs/heads/master@{#475877}
6 files changed
