Exposes a shlib interface for media/audio path.

chromecast/media/media.gyp

Index: chromecast/media/media.gyp
diff --git a/chromecast/media/media.gyp b/chromecast/media/media.gyp
index 8b98ec9cbce80993b66ec9545edb72ca92c69a33..bd2070d4fd03c8305f1a073828e5ff2cb7ebc777 100644
--- a/chromecast/media/media.gyp
+++ b/chromecast/media/media.gyp
@@ -9,6 +9,21 @@
   },
   'targets': [
     {
+      'target_name': 'media_audio',
+      'type': '<(component)',
+      'dependencies': [
+        '../../media/media.gyp:media',
+      ],
+      'sources': [
+        'audio/cast_audio_manager.cc',
+        'audio/cast_audio_manager.h',
+        'audio/cast_audio_manager_factory.cc',
+        'audio/cast_audio_manager_factory.h',
+        'audio/cast_audio_output_stream.cc',
+        'audio/cast_audio_output_stream.h',
+      ],
+    },
+    {
       'target_name': 'media_base',
       'type': '<(component)',
       'dependencies': [
@@ -244,6 +259,7 @@
         'cma_ipc',
         'cma_ipc_streamer',
         'cma_pipeline',
+        'media_audio',
         'media_cdm',
       ],
     },
@@ -262,6 +278,8 @@
         '../../testing/gtest.gyp:gtest_main',
       ],
       'sources': [
+        'audio/cast_audio_manager_factory_test.cc',
+        'audio/cast_audio_manager_unittest.cc',
         'cma/backend/audio_video_pipeline_device_unittest.cc',
         'cma/base/balanced_media_task_runner_unittest.cc',
         'cma/base/buffering_controller_unittest.cc',