Creating GN version of audio_decoder_unittests for linux tool chain

webrtc/modules/BUILD.gn

 # Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("../build/webrtc.gni")
 import("audio_coding/audio_coding.gni")
@@ skipping 353 matching lines @@
       "../system_wrappers:system_wrappers",
       "../test:rtp_test_utils",
       "../test:test_common",
       "../test:test_support_main",
       "../test:test_support_main",
       "../test:video_test_common",
       "../tools:agc_test_utils",
       "audio_coding",
       "audio_coding:acm_receive_test",
       "audio_coding:acm_send_test",
+      "audio_coding:audio_decoder_unittests",
       "audio_coding:builtin_audio_decoder_factory",
       "audio_coding:cng",
       "audio_coding:isac_fix",
       "audio_coding:neteq",
       "audio_coding:neteq_test_support",
       "audio_coding:neteq_unittest_tools",
       "audio_coding:pcm16b",
       "audio_coding:red",
       "audio_coding:webrtc_opus",
       "audio_conference_mixer",
@@ skipping 150 matching lines @@
         "audio_device/ios/objc/RTCAudioSessionTest.mm",
         "video_coding/codecs/h264/h264_video_toolbox_nalu_unittest.cc",
       ]
 
       ldflags = [ "-ObjC" ]
 
       # TODO(kjellander): Mac bundle files.
     }
   }
 }