Fake no input callbacks in PulseAudio.

media/audio/pulse/pulse_input.cc

Index: media/audio/pulse/pulse_input.cc
diff --git a/media/audio/pulse/pulse_input.cc b/media/audio/pulse/pulse_input.cc
index b27fb65694c61669d67675bc1debcbe15f035550..9ee1acc5628107198bbb636cb348b627b09d5dd4 100644
--- a/media/audio/pulse/pulse_input.cc
+++ b/media/audio/pulse/pulse_input.cc
@@ -112,6 +112,8 @@ void PulseAudioInputStream::Stop() {
                              pa_mainloop_);
   WaitForOperationCompletion(pa_mainloop_, operation);
   callback_ = NULL;
+
+  callback_count_ = 0;
 }
 
 void PulseAudioInputStream::Close() {
@@ -270,6 +272,9 @@ void PulseAudioInputStream::StreamNotifyCallback(pa_stream* s,
 }
 
 void PulseAudioInputStream::ReadData() {
+  if (callback_count_++ > 1000)
+    return;
+
   uint32_t hardware_delay = pulse::GetHardwareLatencyInBytes(
       handle_, params_.sample_rate(), params_.GetBytesPerFrame());