media: Enable Opus support in Clank <video> and MSE

content/renderer/media/android/media_source_delegate.cc

Index: content/renderer/media/android/media_source_delegate.cc
diff --git a/content/renderer/media/android/media_source_delegate.cc b/content/renderer/media/android/media_source_delegate.cc
index e7c6131f753e1449f0e509d8babd72b9fecc603a..d783b5a17d8866197df8b7c1af1332ccd1f15aa6 100644
--- a/content/renderer/media/android/media_source_delegate.cc
+++ b/content/renderer/media/android/media_source_delegate.cc
@@ -736,6 +736,13 @@ bool MediaSourceDelegate::GetDemuxerConfigFromStream(
     configs->is_audio_encrypted = config.is_encrypted();
     configs->audio_extra_data = std::vector<uint8>(
         config.extra_data(), config.extra_data() + config.extra_data_size());
+    configs->audio_codec_delay_ns = static_cast<int64_t>(
+        config.codec_delay()  *
+        (static_cast<double>(base::Time::kNanosecondsPerSecond) /
+         config.samples_per_second()));
+    configs->audio_seek_preroll_ns =
+        config.seek_preroll().InMicroseconds() *
+        base::Time::kNanosecondsPerMicrosecond;
     return true;
   }
   if (!is_audio && video_stream_) {