Forward the number of skipped frames by the OS in audio playout.

content/browser/renderer_host/media/audio_renderer_host.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 "content/browser/renderer_host/media/audio_renderer_host.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/logging.h"
 #include "base/memory/shared_memory.h"
@@ skipping 505 matching lines @@
                                        const std::string& device_unique_id) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   // media::AudioParameters is validated in the deserializer.
   if (LookupById(stream_id) != NULL) {
     SendErrorMessage(stream_id);
     return;
   }
 
   // Create the shared memory and share with the renderer process.
-  uint32 shared_memory_size = AudioBus::CalculateMemorySize(params);
+  uint32 shared_memory_size = sizeof(AudioOutputBufferParameters) +
+                              AudioBus::CalculateMemorySize(params);
   scoped_ptr<base::SharedMemory> shared_memory(new base::SharedMemory());
   if (!shared_memory->CreateAndMapAnonymous(shared_memory_size)) {
     SendErrorMessage(stream_id);
     return;
   }
 
   scoped_ptr<AudioSyncReader> reader(
       new AudioSyncReader(shared_memory.get(), params));
   if (!reader->Init()) {
     SendErrorMessage(stream_id);
@@ skipping 254 matching lines @@
   callback.Run(false, device_info);
 }
 
 bool AudioRendererHost::IsAuthorizationStarted(int stream_id) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   const auto& i = authorizations_.find(stream_id);
   return i != authorizations_.end();
 }
 
 }  // namespace content