Add event to media log if origin changes during playback

Add event to media log if origin changes during playback

As this issue has happened at least twice, add a entry in
chrome://media-internals so that an origin change that is not
allowed is noted in the logs to simplify debugging the issue.

BUG=532569, 544911
TEST=entry added when using test case from 544911

Committed: https://crrev.com/66282c1dd37989c997962c2bd1d232cef0354418
Cr-Commit-Position: refs/heads/master@{#355484}

[jrummell, 2015-10-21 21:49:08]

jrummell@chromium.org changed reviewers:
+ dalecurtis@chromium.org

[jrummell, 2015-10-21 21:49:08]

PTAL. I suspect this will conflict with your changes.

[DaleCurtis, 2015-10-22 00:59:40]

Thanks! You'll need to rebase, but lgtm!

[jrummell, 2015-10-22 02:42:26]

The CQ bit was checked by jrummell@chromium.org

[jrummell, 2015-10-22 02:42:26]

The patchset sent to the CQ was uploaded after l-g-t-m from
dalecurtis@chromium.org
Link to the patchset: https://codereview.chromium.org/1418533005/#ps20001
(title: "rebase")

[commit-bot: I haz the power, 2015-10-22 02:42:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1418533005/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1418533005/20001

[commit-bot: I haz the power, 2015-10-22 02:52:33]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-10-22 02:53:21]

Patchset 2 (id:??) landed as
https://crrev.com/66282c1dd37989c997962c2bd1d232cef0354418
Cr-Commit-Position: refs/heads/master@{#355484}