[PPAPI] Pepper MediaStream API audio track implementation and example.

ppapi/ppapi_tests.gypi

 # Copyright (c) 2012 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.
 
 {
   'targets': [
     {
       'target_name': 'ppapi_tests',
       'type': 'loadable_module',
       'include_dirs': [
@@ skipping 506 matching lines @@
         'ppapi_example_skeleton',
         'ppapi.gyp:ppapi_cpp',
       ],
       'sources': [
         'examples/printing/printing.cc',
       ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
     {
+      'target_name': 'ppapi_example_media_stream_audio',
+      'dependencies': [
+        'ppapi_example_skeleton',
+        'ppapi.gyp:ppapi_cpp',
+      ],
+      'sources': [
+        'examples/media_stream_audio/media_stream_audio.cc',
+      ],
+    },
+    {
       'target_name': 'ppapi_example_media_stream_video',
       'dependencies': [
         'ppapi_example_skeleton',
         'ppapi.gyp:ppapi_cpp',
         'ppapi.gyp:ppapi_gles2',
       ],
       'include_dirs': [
         'lib/gl/include',
       ],
       'sources': [
         'examples/media_stream_video/media_stream_video.cc',
       ],
     },
   ],
 }