Video Player: Add accessibility annotations to cast menu

Video Player: Add accessibility annotations to cast menu

BUG=413944
TEST=Instlal ChromeVox and confirms that it speaks both on the icon and on menu item.

Committed: https://crrev.com/ead68f6b2d7725c34766a50397f9039a2a4b6da2
Cr-Commit-Position: refs/heads/master@{#295232}

[yoshiki, 2014-09-17 03:19:59]

yoshiki@chromium.org changed reviewers:
+ fukino@chromium.org

[yoshiki, 2014-09-17 03:20:00]

@fukino-san, PTAL. Thanks.

[fukino, 2014-09-17 04:26:06]

On 2014/09/17 03:20:00, yoshiki wrote:
> @fukino-san, PTAL. Thanks.

lgtm. Thanks!

[yoshiki, 2014-09-17 04:26:24]

The CQ bit was checked by yoshiki@chromium.org

[commit-bot: I haz the power, 2014-09-17 04:26:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/569123003/1

[commit-bot: I haz the power, 2014-09-17 05:22:49]

Committed patchset #1 (id:1) as f22080c28e1ee6d05e9e3262c78e7b257b7b5776

[commit-bot: I haz the power, 2014-09-17 05:23:25]

Patchset 1 (id:??) landed as
https://crrev.com/ead68f6b2d7725c34766a50397f9039a2a4b6da2
Cr-Commit-Position: refs/heads/master@{#295232}