Change the way they store references to eachother to make more sense.
A Track will never belong to a MediaElement directly. It will always
belong to one through a TextTrackList.
Our JS WebVTT implementation (vtt.js) needs access to the Track's
TextTrackList in order to compute the line position of a TextTrackCue.
Therefore, we need to expose it to chrome JS so that vtt.js can have
access to it.
* mDirty needs to be set to false after the list has been recomputed.
* The loop that adds cues to the list doesn't work properly when the
list has become dirty as we check if endTime < playback time and
since we start from pos 0 we will never get past the first cue.
- Active cues now returns the subset of cues in mCueList that are valid
for the current playback time.
- Introduces new code in media element, when seeking, and in TextTrack, when
adding and removing cues, to mark the active cue list as dirty so that we know
when we might need to rebuild the list completely.
- Updated RemoveCue to throw NotFoundError if the cue being removed is
not in the cue list.
- Updated AddCue to not add cues that are already in the list. This is
done by reference comparing.
We were incorrectly using the wrapper cache cycle collection macros when that
functionality was already implemented by the base classes. Therefore, we
should instead use the inherited version of the cycle collection macros.
- Implemented WebVTTLoadListener to manage the webvtt parser.
- TextTrackCue now handles the conversion of webvtt nodes to
anonymous content which will be displayed on the video div
overlay.
- HTMLTrackElement manages the lifetime of the WebVTTLoadListener.
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.
