kAudioIOMax        32 media/audio/linux/audio_manager_linux.cc     UMA_HISTOGRAM_ENUMERATION("Media.LinuxAudioIO", kCras, kAudioIOMax + 1);
kAudioIOMax        40 media/audio/linux/audio_manager_linux.cc     UMA_HISTOGRAM_ENUMERATION("Media.LinuxAudioIO", kPulse, kAudioIOMax + 1);
kAudioIOMax        46 media/audio/linux/audio_manager_linux.cc   UMA_HISTOGRAM_ENUMERATION("Media.LinuxAudioIO", kAlsa, kAudioIOMax + 1);