Introduce AudioBufferMemoryPool to avoid thrashing on audio buffers.

media/cdm/cdm_adapter.h

 // Copyright 2015 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 MEDIA_CDM_CDM_ADAPTER_H_
 #define MEDIA_CDM_CDM_ADAPTER_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/scoped_native_library.h"
 #include "base/threading/thread.h"
+#include "media/base/audio_buffer.h"
 #include "media/base/cdm_config.h"
 #include "media/base/cdm_context.h"
 #include "media/base/cdm_factory.h"
 #include "media/base/cdm_promise_adapter.h"
 #include "media/base/content_decryption_module.h"
 #include "media/base/decryptor.h"
 #include "media/base/media_export.h"
 #include "media/cdm/api/content_decryption_module.h"
 #include "ui/gfx/geometry/size.h"
 
@@ skipping 185 matching lines @@
 
   // Keep track of audio parameters.
   int audio_samples_per_second_;
   ChannelLayout audio_channel_layout_;
 
   std::unique_ptr<CdmAllocator> allocator_;
   CreateCdmFileIOCB create_cdm_file_io_cb_;
 
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
 
+  scoped_refptr<AudioBufferMemoryPool> pool_;
+
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<CdmAdapter> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CdmAdapter);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_CDM_CDM_ADAPTER_H_