Update overlay cast buttons for clank, part 1 of 3.

Make overlay cast buttons for clank partially transparent, part 1 of 3.

The updated design spec for the 'overlay cast off' asset is partially transparent.  This CL incorporates that asset, and moves to the new position of 8px from the upper left.

Also adds an 'overlay cast on' asset, which has been missing for quite some time.  It is unreferenced, but is needed so that it can be added to blink_resources_constants.h in a separate CL.  We can then start using it in blink in a third CL.

BUG=522580
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=201527

[liberato (no reviews please), 2015-08-21 18:55:33]

liberato@chromium.org changed reviewers:
+ pdr@chromium.org

[pdr., 2015-08-21 19:33:33]

On 2015/08/21 at 18:55:50, liberato wrote:
> 

This looks good to me but I'm probably not the best reviewer for UI changes.
Maybe erg@chromium?

What about non-1x assets, particularly on windows and android where the dpis can
differ quite a bit?

[pdr., 2015-08-21 19:33:45]

pdr@chromium.org changed reviewers:
+ erg@chromium.org, philipj@opera.com

[whywhat, 2015-08-21 19:38:37]

avayvod@chromium.org changed reviewers:
+ avayvod@chromium.org

[whywhat, 2015-08-21 19:38:37]

+Jenn and Aberent for a heads up

[Elliot Glaysher, 2015-08-21 19:43:52]

On 2015/08/21 19:33:33, pdr wrote:
> This looks good to me but I'm probably not the best reviewer for UI changes.
> Maybe erg@chromium?

I'm not an owner or otherwise have any power in the blink repository.

[liberato (no reviews please), 2015-08-21 19:51:12]

On 2015/08/21 19:33:33, pdr wrote:
> On 2015/08/21 at 18:55:50, liberato wrote:
> > 
> 
> This looks good to me but I'm probably not the best reviewer for UI changes.
> Maybe erg@chromium?
> 
> What about non-1x assets, particularly on windows and android where the dpis
can
> differ quite a bit?

philipj, whose alias also starts with 'p', is a good choice.  pre-lunch daze +
autocomplete don't work well together.  sorry!

1x: even for android, we use xxxhdpi and scale down for the media player ui. 
it's an area for improvement, i agree, but nontrivial in the current
implementation.

thanks
-fl

[philipj_slow, 2015-08-24 09:47:12]

LGTM, but it's worrying that there are no test failures. It's a good thing that
there aren't any pixel tests, but are there other tests that would fail if the
button disappeared entirely?

[liberato (no reviews please), 2015-08-24 14:19:41]

On 2015/08/24 09:47:12, philipj wrote:
> LGTM, but it's worrying that there are no test failures. It's a good thing
that
> there aren't any pixel tests, but are there other tests that would fail if the
> button disappeared entirely?

there are no test failures because we run only a small subset for android
(SmokeTests, i think).  for other platforms, there is better coverage.  i know
that these failed with the new UI earlier:

media/video-controls-with-cast-rendering.html
media/video-overlay-cast-dark-rendering.html
media/video-overlay-cast-light-rendering.html

[liberato (no reviews please), 2015-08-24 14:19:46]

The CQ bit was checked by liberato@chromium.org

[commit-bot: I haz the power, 2015-08-24 14:19:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1305793002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1305793002/40001

[commit-bot: I haz the power, 2015-08-24 15:04:22]

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

[commit-bot: I haz the power, 2015-08-24 15:04:23]

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_...)

[liberato (no reviews please), 2015-08-25 21:23:20]

The CQ bit was checked by liberato@chromium.org

[commit-bot: I haz the power, 2015-08-25 21:23:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1305793002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1305793002/40001

[commit-bot: I haz the power, 2015-08-25 22:49:30]

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

[commit-bot: I haz the power, 2015-08-25 22:49:31]

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_...)

[liberato (no reviews please), 2015-09-01 05:53:02]

The CQ bit was checked by liberato@chromium.org

[commit-bot: I haz the power, 2015-09-01 05:53:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1305793002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1305793002/40001

[commit-bot: I haz the power, 2015-09-01 07:22:26]

Committed patchset #3 (id:40001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=201527