[Extensions UI] Tweak the constants for extension action grayscaling

[Extensions UI] Tweak the constants for extension action grayscaling

The previous grayscaling wasn't enough for extension actions that were mostly
black-and-white. Make it a little more noticable. Note that this is still a
problem for extension actions that just happen to be gray by default as well
as for a11y. :( See crbug.com/597657.

BUG=597981
Committed: https://crrev.com/f51a8dcc39fba8b6ce644a54f1ff3814e255b03e
Cr-Commit-Position: refs/heads/master@{#383578}

[Devlin, 2016-03-28 21:39:06]

rdevlin.cronin@chromium.org changed reviewers:
+ asargent@chromium.org

[asargent_no_longer_on_chrome, 2016-03-28 22:00:32]

lgtm

[Devlin, 2016-03-28 22:04:00]

The CQ bit was checked by rdevlin.cronin@chromium.org

[commit-bot: I haz the power, 2016-03-28 22:04:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1834293003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1834293003/1

[commit-bot: I haz the power, 2016-03-28 22:10:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-28 22:11:19]

Description was changed from

==========
[Extensions UI] Tweak the constants for extension action grayscaling

The previous grayscaling wasn't enough for extension actions that were mostly
black-and-white. Make it a little more noticable. Note that this is still a
problem for extension actions that just happen to be gray by default as well
as for a11y. :( See crbug.com/597657.

BUG=597981
==========

to

==========
[Extensions UI] Tweak the constants for extension action grayscaling

The previous grayscaling wasn't enough for extension actions that were mostly
black-and-white. Make it a little more noticable. Note that this is still a
problem for extension actions that just happen to be gray by default as well
as for a11y. :( See crbug.com/597657.

BUG=597981

Committed: https://crrev.com/f51a8dcc39fba8b6ce644a54f1ff3814e255b03e
Cr-Commit-Position: refs/heads/master@{#383578}
==========

[commit-bot: I haz the power, 2016-03-28 22:11:19]

Patchset 1 (id:??) landed as
https://crrev.com/f51a8dcc39fba8b6ce644a54f1ff3814e255b03e
Cr-Commit-Position: refs/heads/master@{#383578}