WebVTT <i>, <b> and <u> elements should have default styles
https://bugs.webkit.org/show_bug.cgi?id=107214

Patch by Dima Gorbik <dgorbik@apple.com> on 2013-02-04
Reviewed by Darin Adler.

Source/WebCore:

Added default styles for basic webvtt object types.

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

* css/mediaControls.css:
(video::-webkit-media-text-track-container b):
(video::-webkit-media-text-track-container u):
(video::-webkit-media-text-track-container i):

LayoutTests:

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

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141817 268f45cc-cd09-0410-ab3c-d52691b4dbfc