[Chromecast] Process streams with different post-processing.

chromecast/media/cma/backend/alsa/stream_mixer_alsa_input.h

Index: chromecast/media/cma/backend/alsa/stream_mixer_alsa_input.h
diff --git a/chromecast/media/cma/backend/alsa/stream_mixer_alsa_input.h b/chromecast/media/cma/backend/alsa/stream_mixer_alsa_input.h
index 1490fdbc716594236f2003cb22a0d505a189565d..7304108873d6519c133c735ab76dca3fd654c4e1 100644
--- a/chromecast/media/cma/backend/alsa/stream_mixer_alsa_input.h
+++ b/chromecast/media/cma/backend/alsa/stream_mixer_alsa_input.h
@@ -11,6 +11,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/threading/thread_checker.h"
 #include "chromecast/media/cma/backend/alsa/media_pipeline_backend_alsa.h"
+#include "chromecast/public/media/media_pipeline_device_params.h"
 
 namespace chromecast {
 namespace media {
@@ -50,7 +51,8 @@ class StreamMixerAlsaInput {
   // exist.
   StreamMixerAlsaInput(Delegate* delegate,
                        int samples_per_second,
-                       bool primary);
+                       bool primary,
+                       const std::string& device_id);
   // Removes this input from the mixer, destroying the mixer if there are no
   // remaining inputs.
   ~StreamMixerAlsaInput();