Fix tab coloring bugs with multiple open profiles which used different colors.

Fix tab coloring bugs with multiple open profiles which used different colors.

Instead of caching based on incognito state, cache based on the actual colors
used.

This also fixes what I think was a real bug with not paying attention to a
changing stroke color.

BUG=616403
TEST=Install theme from bug comment 0, hit ctrl-T several times, open a window from a second, unthemed profile, hit ctrl-T more times, and verify the tab background color in the second wnidow is the default one and not the themed one.

Committed: https://crrev.com/85c0fcf270d8f28720054c636748ad506e3a4078
Cr-Commit-Position: refs/heads/master@{#401109}

[Peter Kasting, 2016-06-21 02:00:57]

pkasting@chromium.org changed reviewers:
+ sky@chromium.org

[sky, 2016-06-21 15:51:16]

LGTM

[Peter Kasting, 2016-06-21 21:07:26]

The CQ bit was checked by pkasting@chromium.org

[commit-bot: I haz the power, 2016-06-21 21:07:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2084583004/1

[commit-bot: I haz the power, 2016-06-21 21:17:51]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-21 21:19:50]

Description was changed from

==========
Fix tab coloring bugs with multiple open profiles which used different colors.

Instead of caching based on incognito state, cache based on the actual colors
used.

This also fixes what I think was a real bug with not paying attention to a
changing stroke color.

BUG=616403
TEST=Install theme from bug comment 0, hit ctrl-T several times, open a window
from a second, unthemed profile, hit ctrl-T more times, and verify the tab
background color in the second wnidow is the default one and not the themed one.
==========

to

==========
Fix tab coloring bugs with multiple open profiles which used different colors.

Instead of caching based on incognito state, cache based on the actual colors
used.

This also fixes what I think was a real bug with not paying attention to a
changing stroke color.

BUG=616403
TEST=Install theme from bug comment 0, hit ctrl-T several times, open a window
from a second, unthemed profile, hit ctrl-T more times, and verify the tab
background color in the second wnidow is the default one and not the themed one.

Committed: https://crrev.com/85c0fcf270d8f28720054c636748ad506e3a4078
Cr-Commit-Position: refs/heads/master@{#401109}
==========

[commit-bot: I haz the power, 2016-06-21 21:19:51]

Patchset 1 (id:??) landed as
https://crrev.com/85c0fcf270d8f28720054c636748ad506e3a4078
Cr-Commit-Position: refs/heads/master@{#401109}