Add native log and uma stat when all input shared memory buffers are full

media/audio/audio_input_device.cc

Index: media/audio/audio_input_device.cc
diff --git a/media/audio/audio_input_device.cc b/media/audio/audio_input_device.cc
index bf140cbad4e83b42d152a8556be0d72fc59922d6..17cd4e8734bd2e36585923dfcb84ec5ce1613cda 100644
--- a/media/audio/audio_input_device.cc
+++ b/media/audio/audio_input_device.cc
@@ -309,6 +309,10 @@ void AudioInputDevice::AudioThreadCallback::Process(int pending_data) {
   double volume = buffer->params.volume;
   bool key_pressed = buffer->params.key_pressed;
 
+  // Reset the size of the buffer to 0 to notify the browser that
+  // the buffer has been consumed.
+  buffer->params.size = 0;
+
   // Use pre-allocated audio bus wrapping existing block of shared memory.
   media::AudioBus* audio_bus = audio_buses_[current_segment_id_];