https://bugs.webkit.org/show_bug.cgi?id=117738

Reviewed by Dean Jackson.

Source/WebCore:

No new tests, existing tests updated.

* html/track/InbandTextTrack.cpp:
(WebCore::InbandTextTrack::isSDH): New.

* html/track/InbandTextTrack.h: Add isSDH override.
* html/track/TextTrack.h:

* page/CaptionUserPreferencesMac.mm:
(WebCore::trackDisplayName): Only add "SDH" label if a track claims to be SDH.

* platform/graphics/InbandTextTrackPrivate.h:
(WebCore::InbandTextTrackPrivate::isSDH): New.

* platform/graphics/avfoundation/objc/InbandTextTrackPrivateAVFObjC.h:
* platform/graphics/avfoundation/objc/InbandTextTrackPrivateAVFObjC.mm:
(WebCore::InbandTextTrackPrivateAVFObjC::isSDH): Return true if track has both "transcribes
    spoken dialog for accessibility" and "describes music and sound for accessibility"
    characteristics.

LayoutTests:

* media/video-controls-captions-trackmenu-localized.html:
* media/video-controls-captions-trackmenu-sorted.html:
* platform/mac/media/video-controls-captions-trackmenu-localized-expected.txt:
* platform/mac/media/video-controls-captions-trackmenu-sorted-expected.txt:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@151697 268f45cc-cd09-0410-ab3c-d52691b4dbfc