Track UMA stats for when the renderer side audio device wasn't ready.

content/browser/renderer_host/media/audio_sync_reader.h

 // 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_SYNC_READER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_SYNC_READER_H_
 
 #include "base/file_descriptor_posix.h"
 #include "base/process.h"
 #include "base/sync_socket.h"
@@ skipping 49 matching lines @@
 
   // Shared memory wrapper used for transferring audio data to Read() callers.
   scoped_ptr<media::AudioBus> output_bus_;
 
   // Shared memory wrapper used for transferring audio data from Read() callers.
   scoped_ptr<media::AudioBus> input_bus_;
 
   // Maximum amount of audio data which can be transferred in one Read() call.
   int packet_size_;
 
+  // Track the number of times the renderer missed its real-time deadline and
+  // report a UMA stat during destruction.
+  size_t renderer_callback_count_;
+  size_t renderer_missed_callback_count_;
+
   DISALLOW_COPY_AND_ASSIGN(AudioSyncReader);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_SYNC_READER_H_