Implement audio recording for Linux via ALSA.

media/media.gyp

 # Copyright (c) 2010 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.
 
 {
   'variables': {
     'chromium_code': 1,
     'player_x11_renderer%': 'x11',
   },
   'targets': [
@@ skipping 21 matching lines @@
         'audio/audio_parameters.cc',
         'audio/audio_parameters.h',
         'audio/audio_util.cc',
         'audio/audio_util.h',
         'audio/fake_audio_input_stream.cc',
         'audio/fake_audio_input_stream.h',
         'audio/fake_audio_output_stream.cc',
         'audio/fake_audio_output_stream.h',
         'audio/linux/audio_manager_linux.cc',
         'audio/linux/audio_manager_linux.h',
+        'audio/linux/alsa_input.cc',
+        'audio/linux/alsa_input.h',
         'audio/linux/alsa_output.cc',
         'audio/linux/alsa_output.h',
+        'audio/linux/alsa_util.cc',
+        'audio/linux/alsa_util.h',
         'audio/linux/alsa_wrapper.cc',
         'audio/linux/alsa_wrapper.h',
         'audio/openbsd/audio_manager_openbsd.cc',
         'audio/openbsd/audio_manager_openbsd.h',
         'audio/mac/audio_input_mac.cc',
         'audio/mac/audio_input_mac.h',
         'audio/mac/audio_manager_mac.cc',
         'audio/mac/audio_manager_mac.h',
         'audio/mac/audio_output_mac.cc',
         'audio/mac/audio_output_mac.h',
@@ skipping 579 matching lines @@
       ],
     }],
   ],
 }
 
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