Content Shell test_runner hooks for <audio> and <video> blocking.

Content Shell test_runner hooks for <audio> and <video> blocking.

These hooks are necessary for the LayoutTests in the blink-side CL
referenced below, which adds the ability to block <audio> and <video>
media. The blocking works similarly to the currently implemented ability
to block images.

https://codereview.chromium.org/27694002/

BUG=50132
TEST=LayoutTests in the blink CL pass with this CL patched in

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=275984

[pwnall-personal, 2014-06-08 21:25:58]

Can you please take a look?

I have a blink-side CL depending on this, and it'd be nice to be able to run the
tests for it.
https://codereview.chromium.org/27694002/ 

Thank you so much!

[Dirk Pranke, 2014-06-09 17:19:09]

seems fine.

lgtm.

[pwnall-personal, 2014-06-09 17:55:18]

The CQ bit was checked by costan@gmail.com

[pwnall-personal, 2014-06-09 17:55:29]

On 2014/06/09 17:19:09, Dirk Pranke wrote:
> seems fine.
> 
> lgtm.

Thank you for the speedy review!

[commit-bot: I haz the power, 2014-06-09 17:56:57]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/costan@gmail.com/312103004/1

[commit-bot: I haz the power, 2014-06-10 11:10:41]

Change committed as 275984