[Chromecast] Process streams with different post-processing.

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

Index: chromecast/media/cma/backend/alsa/stream_mixer_alsa_input.cc
diff --git a/chromecast/media/cma/backend/alsa/stream_mixer_alsa_input.cc b/chromecast/media/cma/backend/alsa/stream_mixer_alsa_input.cc
index b3a97df6bb6a7855ec5aa62e92d38c7faa99ced8..52883ac21c595213ff979c58884e74a34104982e 100644
--- a/chromecast/media/cma/backend/alsa/stream_mixer_alsa_input.cc
+++ b/chromecast/media/cma/backend/alsa/stream_mixer_alsa_input.cc
@@ -14,9 +14,11 @@ namespace media {
 
 StreamMixerAlsaInput::StreamMixerAlsaInput(Delegate* delegate,
                                            int samples_per_second,
-                                           bool primary) {
-  std::unique_ptr<StreamMixerAlsaInputImpl> impl(new StreamMixerAlsaInputImpl(
-      delegate, samples_per_second, primary, StreamMixerAlsa::Get()));
+                                           bool primary,
+                                           const std::string& device_id) {
+  std::unique_ptr<StreamMixerAlsaInputImpl> impl(
+      new StreamMixerAlsaInputImpl(delegate, samples_per_second, primary,
+                                   device_id, StreamMixerAlsa::Get()));
   impl_ = impl.get();  // Store a pointer to the impl, but the mixer owns it.
   StreamMixerAlsa::Get()->AddInput(std::move(impl));
 }