Add detection for repeated audio in capturing.

content/renderer/media/media_stream_audio_processor.cc

Index: content/renderer/media/media_stream_audio_processor.cc
diff --git a/content/renderer/media/media_stream_audio_processor.cc b/content/renderer/media/media_stream_audio_processor.cc
index 23547d1b2b6490331f28d0110284f523044e1d57..041032cc12cce3a961ca56079c072ab26e08621e 100644
--- a/content/renderer/media/media_stream_audio_processor.cc
+++ b/content/renderer/media/media_stream_audio_processor.cc
@@ -296,6 +296,13 @@ bool MediaStreamAudioProcessor::ProcessAndConsumeData(
   if (!capture_fifo_->Consume(&process_bus, capture_delay))
     return false;
 
+  // Detect bit-exact repetition of audio present in the captured audio.
+  // We detect only one channel.
+  audio_repetition_detector_.Detect(process_bus->bus()->channel(0),
+                                    process_bus->bus()->frames(),
+                                    1,  // number of channels
+                                    input_format_.sample_rate());
+
   // Use the process bus directly if audio processing is disabled.
   MediaStreamAudioBus* output_bus = process_bus;
   *new_volume = 0;