Share a common alpha value used for displaying disabled state in Harmony

Share a common alpha value used for displaying disabled state in Harmony
controls.

In the future it might be desirable to remove some disabled color IDs
(like LabelDisabledColor) in favor of just applying this alpha at
callsites.

BUG=none

Committed: https://crrev.com/def1af9b4c59dc452c2739b790b656f9a489a29d
Cr-Commit-Position: refs/heads/master@{#419488}

[Evan Stade, 2016-09-16 17:55:51]

estade@chromium.org changed reviewers:
+ ellyjones@chromium.org, sky@chromium.org

[sky, 2016-09-16 21:13:56]

LGTM

[Elly Fong-Jones, 2016-09-19 11:08:16]

lgtm

[Evan Stade, 2016-09-19 16:22:20]

The CQ bit was checked by estade@chromium.org

[commit-bot: I haz the power, 2016-09-19 16:22:29]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-19 17:11:22]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-09-19 17:13:50]

Description was changed from

==========
Share a common alpha value used for displaying disabled state in Harmony
controls.

In the future it might be desirable to remove some disabled color IDs
(like LabelDisabledColor) in favor of just applying this alpha at
callsites.

BUG=none
==========

to

==========
Share a common alpha value used for displaying disabled state in Harmony
controls.

In the future it might be desirable to remove some disabled color IDs
(like LabelDisabledColor) in favor of just applying this alpha at
callsites.

BUG=none

Committed: https://crrev.com/def1af9b4c59dc452c2739b790b656f9a489a29d
Cr-Commit-Position: refs/heads/master@{#419488}
==========

[commit-bot: I haz the power, 2016-09-19 17:13:51]

Patchset 2 (id:??) landed as
https://crrev.com/def1af9b4c59dc452c2739b790b656f9a489a29d
Cr-Commit-Position: refs/heads/master@{#419488}