Generate FlexBoxData.

This patch generates all FlexBoxData fields as storage_only.

Diff of generated files:
https://gist.github.com/8ad3b03a2696bd4766f95abbf967a1c8/revisions

Bug: 628043
Change-Id: Ie3b865e9359bb46ace74b0de797dfd75c81a0f9e
Reviewed-on: https://chromium-review.googlesource.com/535254
Commit-Queue: Darren Shen <shend@chromium.org>
Reviewed-by: nainar <nainar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#479658}
7 files changed