This is part of a change to convert all usages of 'var' with either
'let' or 'const'. This takes a conservative approach for 'const' where
it will only be used for aliases and storing the "original" values in
tests.
Change-Id: I6a329d28e13a81c9f7136737518c6bb8fa18402e
When a text track's mode is set to "disabled" the cues exposed cue
list is set to null. However, if you save a reference to the list,
the reference is valid. If the track is disabled, the add and remove
calls still work.
This change caches the reference to the cue's list when the track is
first created so that we can always read it - regardless of what mode
the track is set to.
Fix#990
Change-Id: I8274ea8450e664eeaa359bf9e78d13405fd2e503
Jacob Trimble
Aaron Vaage