[Webkit-unassigned] [Bug 119029] New: Fix HTMLMediaElement so that it doesn't add cues for disabled text tracks

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=119029

           Summary: Fix HTMLMediaElement so that it doesn't add cues for
                    disabled text tracks
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate
          Severity: Normal
          Priority: P2
         Component: Media Elements
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: eric.carlson at apple.com, jer.noble at apple.com


Consider merging https://chromium.googlesource.com/chromium/blink/+/3aed1192f832e597e96c4f7695b7ab8d3a2339eb

This patch reverts the change to TextTrackCue added in
https://src.chromium.org/viewvc/blink?revision=153206&view=revision
and addresses the actual underlying issue. The real problem
is that HTMLMediaElement was allowing cues from disabled
tracks to be added to  m_cueTree under certain
circumstances.  This patch adds checks to textTrackAddCues() 
and textTrackAddCue() to prevent disabled track cues from
being added.

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