Generate enum/getters/setters/mappings for PageSizeType and generate getters/setters for PageSize.

Currently, the PageSizeType 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 EPageSizeType enum and
use the generated CSSValueID <-> EPageSizeType mappings.

Currently, the PageSize property is a 'storage_only' field, so
it has no generated public getters/setters. This patch changes it to an
'external' field so that its getters/setters can be generated as well.

Diff: https://gist.github.com/nainar/56c531266c03e887ba3d94fdcb5d4dbe/revisions

BUG=628043

Change-Id: Ifbd64f6d98bff06be6e46ce5ae7e3a5ceeb081a3
Reviewed-on: https://chromium-review.googlesource.com/538396
Reviewed-by: Darren Shen <shend@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: nainar <nainar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#480343}
6 files changed