[Mac] respect in-band caption color
https://bugs.webkit.org/show_bug.cgi?id=109203

Reviewed by Dean Jackson.

Source/WebCore: 

Test: media/track/track-in-band-style.html

* WebCore.xcodeproj/project.pbxproj: Add HTMLDivElement.h to private headers because it is 
    included by HTMLTextElement, which is included by HTMLMediaElement.h, which is included 
    by files in WebKit/WebKit2.
* html/track/InbandTextTrack.cpp:
(WebCore::InbandTextTrack::addGenericCue): Set cue colors if necessary.

* html/track/TextTrackCue.h:
(WebCore::TextTrackCue::element): New, accessor for the cue element so it can be styled.

* html/track/TextTrackCueGeneric.cpp:
(WebCore::TextTrackCueGenericBoxElement::applyCSSProperties): Set container and cue background 
    color if necessary.
(WebCore::TextTrackCueGeneric::operator==): Compare cue colors.
* html/track/TextTrackCueGeneric.h:
(WebCore::TextTrackCueGeneric::foregroundColor): Add color accessors.
(WebCore::TextTrackCueGeneric::setForegroundColor):
(WebCore::TextTrackCueGeneric::backgroundColor):
(WebCore::TextTrackCueGeneric::setBackgroundColor):

* page/CaptionUserPreferencesMac.mm:
(WebCore::CaptionUserPreferencesMac::registerForCaptionPreferencesChangedCallbacks): Always
    regenerate override CSS when an element registers for callbacks.
(WebCore::CaptionUserPreferencesMac::captionsWindowCSS): Drive by fix of "window color" padding.
(WebCore::CaptionUserPreferencesMac::captionsStyleSheetOverride): Log the stylesheet generated
    for easier debugging.

* platform/graphics/InbandTextTrackPrivateClient.h:
(WebCore::GenericCueData::foregroundColor): Add color getters/setters.
(WebCore::GenericCueData::setForegroundColor):
(WebCore::GenericCueData::backgroundColor):
(WebCore::GenericCueData::setBackgroundColor):

* platform/graphics/avfoundation/InbandTextTrackPrivateAVF.cpp:
(WebCore::makeRGBA32FromARGBCFArray): Initialize a RGBA32 from a CFArray of color values.
(WebCore::InbandTextTrackPrivateAVF::processCueAttributes): Process cue colors.

LayoutTests: 

* media/track/track-in-band-style-expected.txt: Added.
* media/track/track-in-band-style.html: Added.

* platform/chromium/TestExpectations: Skip new test.
* platform/efl/TestExpectations: Ditto.
* platform/gtk/TestExpectations: Ditto.
* platform/mac/TestExpectations: Ditto.
* platform/qt/TestExpectations: Ditto.
* platform/win/TestExpectations: Ditto.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@142349 268f45cc-cd09-0410-ab3c-d52691b4dbfc