Respect fallback colors when interpolating text-decoration-color.

Respect fallback colors when interpolating text-decoration-color.

Currently, we interpolate the incorrect colors if one of the fallback
colors (other than currentColor) are used for text decoration. This happens
because we bypass the fallback code when creating the AnimatableValues.

This patch moves the color retrieving code for text decoration into
the main RenderStyle::colorIncludingCallback function, and changes callers
to use visitedDependentColor/colorIncludingFallback also for
CSSPropertyTextDecorationColor. This is better, because you don't have to
do anything special with the text decoration color compared to all other
colors.

R=alancutter@chromium.org
BUG=435546
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=185870

[alancutter (OOO until 2018), 2014-11-24 00:01:10]

lgtm thanks!

[Timothy Loh, 2014-11-24 02:10:50]

On 2014/11/24 00:01:10, alancutter wrote:
> lgtm thanks!

OWNER rubber stamp lgtm

[andersr, 2014-11-24 09:40:05]

The CQ bit was checked by andersr@opera.com

[commit-bot: I haz the power, 2014-11-24 09:43:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/746173002/1

[commit-bot: I haz the power, 2014-11-24 12:23:02]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=185870