HasInputChannel   103 media/base/channel_mixer.cc   bool HasInputChannel(Channels ch);
HasInputChannel   224 media/base/channel_mixer.cc       float scale = HasInputChannel(SIDE_LEFT) ? kEqualPowerScale : 1;
HasInputChannel   247 media/base/channel_mixer.cc       float scale = HasInputChannel(BACK_LEFT) ? kEqualPowerScale : 1;