[New Tab Page] Change color format used by NTP_DESIGN.

[New Tab Page] Change color format used by NTP_DESIGN.

NTP_DESIGN has 3 colors that were specified in RRGGBBAA format. These
values were injected into title.html iframe via query param. The recent
fast local NTP takes rgba(r,g,b,a) format. Rather than writing converter
from RRGBBAA to 4-component, we simply store NTP_DESIGN colors in
4-component (like themes), and use existing converters in old NTP
and fast NTP where needed. Also fixing title color bug in fast NTP.

BUG=

Committed: https://crrev.com/ff8ceebf8ffd99c303ae634919c5c2c845913439
Cr-Commit-Position: refs/heads/master@{#321993}

[huangs, 2015-03-24 04:24:01]

huangs@chromium.org changed reviewers:
+ mathp@chromium.org

[huangs, 2015-03-24 04:24:01]

PTAL.

[Mathieu, 2015-03-24 13:39:27]

The CQ bit was checked by mathp@chromium.org

[Mathieu, 2015-03-24 13:39:28]

lgtm

[commit-bot: I haz the power, 2015-03-24 13:39:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1007323008/1

[commit-bot: I haz the power, 2015-03-24 13:44:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-24 13:45:11]

Patchset 1 (id:??) landed as
https://crrev.com/ff8ceebf8ffd99c303ae634919c5c2c845913439
Cr-Commit-Position: refs/heads/master@{#321993}