See comment 50 for the cause. Since file_silentAudioTrack.html calls play() to
start playback immediately, it is possible that 'mozentervideosuspend' has been
fired before check_video_decoding_state() has a chance to register event handlers.
We call load() and play() to start playback from the beginning so we won't miss
any events.
MozReview-Commit-ID: 9sKygfIxEtS
--HG--
extra : rebase_source : 32b087b808995f771b6fba901f9922af79169af0
extra : intermediate-source : 3fdd51bfa62909066db4813eee4baf0f3caefbdf
extra : source : ad64cd308ce5bb8378d884bf3342c3d8133f144a
c09933eecf