Tone down the hover effect on mousing over background tabs.

Tone down the hover effect on mousing over background tabs.

* Reduce the peak opacity of the highlight from 50% to 25%.
* Reduce the radius from (tab width / 3) to (tab width / 4).  Add a 16 px
  minimum radius to keep things from getting too tiny on very narrow tabs.  This
  also removes the "radius > 0" check, which should have never been false
  anyway, as that would require a tab width of 0, in which case we wouldn't be
  drawing anything.

In MD, incognito windows have very dark tabs, on which the previous highlight is
a bit out of control.  This makes things feel more manageable.

BUG=none
TEST=none

Committed: https://crrev.com/f50089343ce1c5854cc498dce2047de7b0db2823
Cr-Commit-Position: refs/heads/master@{#369672}

[Peter Kasting, 2016-01-15 00:44:24]

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

[sky, 2016-01-15 00:57:44]

LGTM

[Peter Kasting, 2016-01-15 01:39:19]

The CQ bit was checked by pkasting@chromium.org

[commit-bot: I haz the power, 2016-01-15 01:41:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1587873004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1587873004/1

[commit-bot: I haz the power, 2016-01-15 02:35:47]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-01-15 02:35:47]

Try jobs failed on following builders:
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[Peter Kasting, 2016-01-15 02:40:54]

The CQ bit was checked by pkasting@chromium.org

[commit-bot: I haz the power, 2016-01-15 02:41:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1587873004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1587873004/1

[commit-bot: I haz the power, 2016-01-15 03:17:17]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-15 03:18:30]

Description was changed from

==========
Tone down the hover effect on mousing over background tabs.

* Reduce the peak opacity of the highlight from 50% to 25%.
* Reduce the radius from (tab width / 3) to (tab width / 4).  Add a 16 px
  minimum radius to keep things from getting too tiny on very narrow tabs.  This
  also removes the "radius > 0" check, which should have never been false
  anyway, as that would require a tab width of 0, in which case we wouldn't be
  drawing anything.

In MD, incognito windows have very dark tabs, on which the previous highlight is
a bit out of control.  This makes things feel more manageable.

BUG=none
TEST=none
==========

to

==========
Tone down the hover effect on mousing over background tabs.

* Reduce the peak opacity of the highlight from 50% to 25%.
* Reduce the radius from (tab width / 3) to (tab width / 4).  Add a 16 px
  minimum radius to keep things from getting too tiny on very narrow tabs.  This
  also removes the "radius > 0" check, which should have never been false
  anyway, as that would require a tab width of 0, in which case we wouldn't be
  drawing anything.

In MD, incognito windows have very dark tabs, on which the previous highlight is
a bit out of control.  This makes things feel more manageable.

BUG=none
TEST=none

Committed: https://crrev.com/f50089343ce1c5854cc498dce2047de7b0db2823
Cr-Commit-Position: refs/heads/master@{#369672}
==========

[commit-bot: I haz the power, 2016-01-15 03:18:30]

Patchset 1 (id:??) landed as
https://crrev.com/f50089343ce1c5854cc498dce2047de7b0db2823
Cr-Commit-Position: refs/heads/master@{#369672}