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matthewjheaney@chromium.org authored
The TextTrack subsystem in Blink unconditionally satisfies a request to add a new text cue to the text track cue list, relying on the upstream demuxers to filter out cues that have already been added to that list. The TextRenderer now manages a map of time range objects, to keep track of which cues (based on their start times) have already been pushed downstream prior to the current seek. BUG=230708 Review URL: https://codereview.chromium.org/151103005 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249845 0039d316-1c4b-4281-b951-d872f2087c98
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