PlaybackRateChangedTask  135 media/base/pipeline.cc         &Pipeline::PlaybackRateChangedTask, base::Unretained(this),
PlaybackRateChangedTask  601 media/base/pipeline.cc   PlaybackRateChangedTask(GetPlaybackRate());
PlaybackRateChangedTask  266 media/base/pipeline.h   void PlaybackRateChangedTask(float playback_rate);