https://bugs.webkit.org/show_bug.cgi?id=101670

Reviewed by Eric Carlson.

Source/WebCore:

Hook up the event handler for the captions menu so that it enables or
disables tracks in the associated HTMLMediaElement.

Test: media/video-controls-captions-trackmenu.html

* html/HTMLMediaElement.cpp:
(WebCore::HTMLMediaElement::toggleTrackAtIndex): New method to toggle the state of a track, by index.
* html/HTMLMediaElement.h:
(HTMLMediaElement): Ditto.
(WebCore::HTMLMediaElement::textTracksOffIndex): Static method to return the "Off" value.
* html/shadow/MediaControlElements.cpp:
(WebCore::trackListIndexForElement): Helper function to take a track list <li> element and return the value of the custom attribute.
(WebCore::MediaControlToggleClosedCaptionsButtonElement::updateDisplayType): Toggle the state of the button based on captions visibility.
(WebCore::MediaControlToggleClosedCaptionsButtonElement::defaultEventHandler): On Mac platforms show the captions menu. On other platforms, toggle captions.
(WebCore::MediaControlClosedCaptionsTrackListElement::MediaControlClosedCaptionsTrackListElement): Now has a reference to the controls.
(WebCore::MediaControlClosedCaptionsTrackListElement::create):
(WebCore::MediaControlClosedCaptionsTrackListElement::defaultEventHandler): When the user clicks on a track list item, look
for the custom attribute that identifies the associated track, and then toggle that track.
(WebCore::MediaControlClosedCaptionsTrackListElement::updateDisplay): Set a class on the track list elements so they can be
styled by the injected CSS (with tick marks to represent visibility).
(WebCore::MediaControlClosedCaptionsTrackListElement::resetTrackListMenu): When building the list of track menu items, add
a custom HTML attribute to the element so that the corresponding track can be found in the event handler.
* html/shadow/MediaControlElements.h:
(MediaControlClosedCaptionsTrackListElement): Add a list of elements representing the track list.
* html/shadow/MediaControlsApple.cpp:
(WebCore::MediaControlsApple::createControls):
(WebCore::MediaControlsApple::changedClosedCaptionsVisibility): Make sure to update the track menu.
(WebCore::MediaControlsApple::reset):
* html/shadow/MediaControlsApple.h:
(MediaControlsApple):

LayoutTests:

New test that exercises the track list menu, and how it can be used
to enable specific tracks. Since this is only enabled for Mac, it is
skipped on all other platforms.

Meanwhile, the existing test for a on/off captions button now
does not work on Mac, so skip it there. I copied the functionality
into the new test so we still have coverage.

* media/video-controls-captions-trackmenu-expected.txt: Added.
* media/video-controls-captions-trackmenu.html: Added.
* platform/chromium/TestExpectations:
* platform/efl/TestExpectations:
* platform/gtk/TestExpectations:
* platform/mac/TestExpectations:
* platform/qt/TestExpectations:
* platform/win/TestExpectations:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@135934 268f45cc-cd09-0410-ab3c-d52691b4dbfc