Add UseCounter for TextTrackCue constructor

Add UseCounter for TextTrackCue constructor

The plan in issue 270340 is to leave the TextTrackCue constructor until
it is known to be safe to deprecate and remove. Add a UseCounter so that
we can get stats from M32 stable, to be branched Nov 4th, 2013.

BUG=270340
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=160707

[philipj_slow, 2013-10-27 10:50:48]

Glenn, perhaps you've already done this, but in case 270340 isn't landed before
the branch date, I thought it would be good to add it separately, so that we get
the data needed for removal ASAP.

[nessy, 2013-10-27 11:30:38]

Great idea - getting these numbers is important.

[vcarbune.chromium, 2013-10-27 14:09:05]

Not my review, but I also support this. lgtm
On Oct 27, 2013 4:30 AM, <silviapf@chromium.org> wrote:

> Great idea - getting these numbers is important.
>
>
https://codereview.chromium.**org/47453002/<https://codereview.chromium.org/4...
>

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[gasubic, 2013-10-27 14:36:54]

lgtm

[jochen (gone - plz use gerrit), 2013-10-28 08:11:06]

lgtm

[commit-bot: I haz the power, 2013-10-28 08:18:02]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/philipj@opera.com/47453002/1

[commit-bot: I haz the power, 2013-10-28 09:31:40]

Change committed as 160707