https://bugs.webkit.org/show_bug.cgi?id=107907

Patch by Dima Gorbik <dgorbik@apple.com> on 2013-01-25
Reviewed by Eric Carlson.

Source/WebCore:

Language stack and WebVTT language nodes are added as
required by specs.

Test: media/track/track-css-matching-lang.html

* html/track/TextTrackCue.cpp:
(WebCore::TextTrackCue::copyWebVTTNodeToDOMTree): WebVTT language nodes should be
spans in DOM and the lang attribute should be set for all nodes if applicable.
* html/track/TextTrackCue.h:
(WebCore::TextTrackCue::langElementTagName):
(TextTrackCue):
(WebCore::TextTrackCue::langAttributeName):
* html/track/WebVTTParser.cpp:
(WebCore::WebVTTParser::createDocumentFragmentFromCueText): clear the language stack in case
we use the same parser object for multiple cues that have incorrect syntax.
(WebCore::isLangToken):
(WebCore):
(WebCore::WebVTTParser::constructTreeFromToken): parse lang WebVTT objects.
* html/track/WebVTTParser.h:
(WebVTTParser):

LayoutTests:

* media/track/captions-webvtt/styling-lang.vtt: Added.
* media/track/track-css-matching-lang-expected.txt: Added.
* media/track/track-css-matching-lang.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@140877 268f45cc-cd09-0410-ab3c-d52691b4dbfc