GitLab

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

Review URL: https://codereview.chromium.org/312103004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@275984 0039d316-1c4b-4281-b951-d872f2087c98