From 8f5dccf7fd5f5d2a74341ead60586346e4ab3ead Mon Sep 17 00:00:00 2001
Now throwing javascript exceptions from attribute setters for TextTrack-related DOM classes.
As can be seen in http://dev.w3.org/html5/webvtt/#webvtt-api, some of the attributes require validation and throwing.
There is no validation implemented to the align property because there is a bug opened against the spec to change it to an Enum.
When cleared, it should have the IDL changed to remove the throwing.
Validation comments were removed from the properties that didn't have proper validation defined by the spec.
Add webidl interfaces and implementations of the HTML <track>
element and related TextTrack, TextTrackList, TextTrackCue,
and TextTrackCueList dom objects.
Visibility is controlled by the media.webvtt.enabled pref,
which defaults to false.
HTMLMediaElement:NewURIFromString() is hoisted to
nsGenericHTMLElement so it's available to the track
element as well.
This patch is primarily work by Dale Karp, David Humphrey
and others as Seneca College.
