Chromecast: Add media_caps.h to unblock internal builds

Chromecast: Add media_caps.h to unblock internal builds

media_caps.h is included by some of the Chromecast code,
but none of the functions from there are being used at the
moment.

BUG=none

Committed: https://crrev.com/17445da82d3d68e3f1e8ced61a1f2a6264180d31
Cr-Commit-Position: refs/heads/master@{#310128}

[servolk, 2015-01-06 19:14:25]

servolk@chromium.org changed reviewers:
+ gunsch@chromium.org, lcwu@chromium.org

[gunsch, 2015-01-06 19:16:40]

On 2015/01/06 19:14:32, servolk wrote:

lgtm

For posterity, link to the first CL with more discussion:

https://codereview.chromium.org/821063003/

[servolk, 2015-01-06 19:19:55]

The CQ bit was checked by servolk@chromium.org

[commit-bot: I haz the power, 2015-01-06 19:20:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/830423005/1

[commit-bot: I haz the power, 2015-01-06 20:17:32]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-06 20:18:31]

Patchset 1 (id:??) landed as
https://crrev.com/17445da82d3d68e3f1e8ced61a1f2a6264180d31
Cr-Commit-Position: refs/heads/master@{#310128}