New SELECT Popup: Reduce the size of JSON data.

New SELECT Popup: Reduce the size of JSON data.

This CL reduces the size of JSON data which is passed from the origin document
to the popup. For example, we pass 'display' CSS property of an OPTION element
only if display:none.

This CL reduces time to open 43k OPTION popup by 0.5sec on my machine.

BUG=500401
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=197452

[tkent, 2015-06-19 05:20:46]

tkent@chromium.org changed reviewers:
+ keishi@chromium.org

[tkent, 2015-06-19 05:20:46]

Keishi, please review this.

[keishi, 2015-06-19 05:22:54]

LGTM

[tkent, 2015-06-19 06:33:18]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2015-06-19 06:33:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1193813002/1

[commit-bot: I haz the power, 2015-06-19 07:33:17]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=197452