[Chromecast] Process streams with different post-processing.

chromecast/media/cma/backend/alsa/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/buildflag_header.gni")
 import("//build/config/chromecast_build.gni")
 import("//chromecast/chromecast.gni")
 import("//media/media_options.gni")
 import("//testing/test.gni")
 
@@ skipping 20 matching lines @@
     "//media",
   ]
 }
 
 source_set("alsa_cma_backend") {
   sources = [
     "alsa_wrapper.cc",
     "alsa_wrapper.h",
     "audio_decoder_alsa.cc",
     "audio_decoder_alsa.h",
+    "filter_group.cc",
+    "filter_group.h",
     "media_pipeline_backend_alsa.cc",
     "media_pipeline_backend_alsa.h",
     "stream_mixer_alsa.cc",
     "stream_mixer_alsa.h",
     "stream_mixer_alsa_input.cc",
     "stream_mixer_alsa_input.h",
     "stream_mixer_alsa_input_impl.cc",
     "stream_mixer_alsa_input_impl.h",
   ]
 
@@ skipping 87 matching lines @@
   public_deps = [
     ":alsa_cma_backend",
   ]
 
   deps = [
     "//base",
     "//media",
     "//testing/gmock",
   ]
 }