[Chromecast] Plumbs raw audio through CMA backend.

chromecast/media/audio/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.
 
-source_set("metrics") {
+source_set("audio") {
   sources = [
-    "cast_histograms.h",
-    "cast_metrics_helper.cc",
-    "cast_metrics_helper.h",
-    "grouped_histogram.cc",
-    "grouped_histogram.h",
+    "audio_manager.cc",
+    "audio_manager.h",
+    "audio_manager_factory.cc",
+    "audio_manager_factory.h",
+    "audio_output_stream.cc",
+    "audio_output_stream.h",
   ]
 
   configs += [ "//chromecast:config" ]
 
+  public_deps = [
+    "//chromecast/public/media",
+  ]
+
   deps = [
-    "//base",
+    "//media",
   ]
 }
 
 source_set("test_support") {
   testonly = true
 
   sources = [
-    "cast_metrics_test_helper.cc",
-    "cast_metrics_test_helper.h",
-  ]
-
-  public_deps = [
-    ":metrics",
-  ]
-
-  deps = [
-    "//base",
+    "audio_output_stream_unittest.cc",
   ]
 
   configs += [ "//chromecast:config" ]
+
+  deps = [
+    ":audio",
+    "//testing/gtest",
+  ]
 }