Adding CHECK(false) for case when input audio fails to start on Mac

media/audio/mac/audio_low_latency_input_mac.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/audio/mac/audio_low_latency_input_mac.h"
 
 #include <CoreServices/CoreServices.h>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
@@ skipping 751 matching lines @@
     // problem and the stream is considered dead.
     const bool input_callback_is_active = GetInputCallbackIsActive();
     UMA_HISTOGRAM_BOOLEAN("Media.Audio.InputStartupSuccessMac",
                           input_callback_is_active);
     DVLOG(1) << "input_callback_is_active: " << input_callback_is_active;
 
     if (!input_callback_is_active) {
       // Now when we know that startup has failed for some reason, add extra
       // UMA stats in an attempt to figure out the exact reason.
       AddHistogramsForFailedStartup();
+      // Kill the browser and create a crash log. This is just a temporary
+      // test (intended for Canary) where the goal is to gather some more
+      // detailed stats about how and why we can hit this problem.
+      // See crbug.com/549021 for details.
+      CHECK(false);
     }
   }
 }
 
 void AUAudioInputStream::CloseAudioUnit() {
   DCHECK(thread_checker_.CalledOnValidThread());
   if (!audio_unit_)
     return;
   OSStatus result = AudioUnitUninitialize(audio_unit_);
   OSSTATUS_DLOG_IF(ERROR, result != noErr, result)
@@ skipping 12 matching lines @@
                         buffer_size_was_changed_);
   UMA_HISTOGRAM_COUNTS_1000("Media.Audio.NumberOfOutputStreamsMac",
                             manager_->output_streams());
   UMA_HISTOGRAM_COUNTS_1000("Media.Audio.NumberOfLowLatencyInputStreamsMac",
                             manager_->low_latency_input_streams());
   UMA_HISTOGRAM_COUNTS_1000("Media.Audio.NumberOfBasicInputStreamsMac",
                             manager_->basic_input_streams());
 }
 
 }  // namespace media