Consolidate and improve audio decoding test for all decoders.

media/media.gyp

Index: media/media.gyp
diff --git a/media/media.gyp b/media/media.gyp
index bd6f659a27b52236fe280832b1c8848817ada970..378e3686a326a08318e4ed25f4bf2afd57839de3 100644
--- a/media/media.gyp
+++ b/media/media.gyp
@@ -1045,6 +1045,7 @@
         'cdm/json_web_key_unittest.cc',
         'ffmpeg/ffmpeg_common_unittest.cc',
         'filters/audio_clock_unittest.cc',
+        'filters/audio_decoder_unittest.cc',
         'filters/audio_decoder_selector_unittest.cc',
         'filters/audio_file_reader_unittest.cc',
         'filters/audio_renderer_algorithm_unittest.cc',
@@ -1060,7 +1061,6 @@
         'filters/fake_video_decoder.cc',
         'filters/fake_video_decoder.h',
         'filters/fake_video_decoder_unittest.cc',
-        'filters/ffmpeg_audio_decoder_unittest.cc',
         'filters/ffmpeg_demuxer_unittest.cc',
         'filters/ffmpeg_glue_unittest.cc',
         'filters/ffmpeg_video_decoder_unittest.cc',
@@ -1069,7 +1069,6 @@
         'filters/h264_bit_reader_unittest.cc',
         'filters/h264_parser_unittest.cc',
         'filters/in_memory_url_protocol_unittest.cc',
-        'filters/opus_audio_decoder_unittest.cc',
         'filters/pipeline_integration_test.cc',
         'filters/pipeline_integration_test_base.cc',
         'filters/skcanvas_video_renderer_unittest.cc',
@@ -1143,15 +1142,14 @@
             'audio/audio_input_volume_unittest.cc',
             'base/container_names_unittest.cc',
             'ffmpeg/ffmpeg_common_unittest.cc',
+            'filters/audio_decoder_unittest.cc',
             'filters/audio_file_reader_unittest.cc',
             'filters/blocking_url_protocol_unittest.cc',
-            'filters/ffmpeg_audio_decoder_unittest.cc',
             'filters/ffmpeg_demuxer_unittest.cc',
             'filters/ffmpeg_glue_unittest.cc',
             'filters/ffmpeg_h264_to_annex_b_bitstream_converter_unittest.cc',
             'filters/ffmpeg_video_decoder_unittest.cc',
             'filters/in_memory_url_protocol_unittest.cc',
-            'filters/opus_audio_decoder_unittest.cc',
             'filters/pipeline_integration_test.cc',
             'filters/pipeline_integration_test_base.cc',
           ],