Add some checks for MediaStreamAudioProcessor's fifo.

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 26acd99c8c90c719034bcd6929ed25f2dd160610..168697e20b945e217c530e11acb237d000e04164 100644
--- a/content/renderer/media/media_stream_audio_processor.cc
+++ b/content/renderer/media/media_stream_audio_processor.cc
@@ -211,10 +211,12 @@ class MediaStreamAudioFifo {
     }
 
     if (fifo_) {
+      CHECK_LT(fifo_->frames(), destination_->bus()->frames());
       next_audio_delay_ = audio_delay +
           fifo_->frames() * base::TimeDelta::FromSeconds(1) / sample_rate_;
       fifo_->Push(source_to_push);
     } else {
+      CHECK(!data_available_);
       source_to_push->CopyTo(destination_->bus());
       next_audio_delay_ = audio_delay;
       data_available_ = true;