Re-add AC3/EAC3 audio demuxing support

media/media.gyp

Index: media/media.gyp
diff --git a/media/media.gyp b/media/media.gyp
index 89e1ade22695a566e6b3fe11a4fe4a46eaab32ab..5558c1f893a9bc576112eae94c88a346091feb1c 100644
--- a/media/media.gyp
+++ b/media/media.gyp
@@ -34,8 +34,12 @@
         'use_low_memory_buffer%': 0,
       }],
       ['chromecast == 1', {
+        # Enable AC3/EAC3 audio demuxing. Actual decoding must be provided by the

[ddorwin, 2016/01/08 18:11:02]

nit: Regarding line lengths: If it can be done and you are already breaking up
the line, I think it's better to try. Being one character off looks wrong. In
this case, I think "the " will fit below.

[servolk, 2016/01/08 20:02:32]

Done.

+        # platform (or HDMI sink in Chromecast for audio pass-through case).
+        'enable_ac3_eac3_audio_demuxing%': 1,
         'enable_mse_mpeg2ts_stream_parser%': 1,
       }, {
+        'enable_ac3_eac3_audio_demuxing%': 0,
         'enable_mse_mpeg2ts_stream_parser%': 0,
       }],
       ['chromecast==1', {
@@ -59,6 +63,7 @@
       'variables': {
         'buildflag_header_path': 'media/media_features.h',
         'buildflag_flags': [
+          "ENABLE_AC3_EAC3_AUDIO_DEMUXING=<(enable_ac3_eac3_audio_demuxing)",
           "ENABLE_MSE_MPEG2TS_STREAM_PARSER=<(enable_mse_mpeg2ts_stream_parser)",
         ],
       },