media: Add out-of-line copy ctors for complex classes.

media/base/bitstream_buffer.cc

 // 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.
 
 #include "media/base/bitstream_buffer.h"
 
 namespace media {
 
 BitstreamBuffer::BitstreamBuffer(int32_t id,
                                  base::SharedMemoryHandle handle,
                                  size_t size)
     : id_(id),
       handle_(handle),
       size_(size),
       presentation_timestamp_(kNoTimestamp()) {}
 
 BitstreamBuffer::BitstreamBuffer(int32_t id,
                                  base::SharedMemoryHandle handle,
                                  size_t size,
                                  base::TimeDelta presentation_timestamp)
     : id_(id),
       handle_(handle),
       size_(size),
       presentation_timestamp_(presentation_timestamp) {}
 
+BitstreamBuffer::BitstreamBuffer(const BitstreamBuffer& other) = default;
+
 BitstreamBuffer::~BitstreamBuffer() {}
 
 void BitstreamBuffer::SetDecryptConfig(const DecryptConfig& decrypt_config) {
   key_id_ = decrypt_config.key_id();
   iv_ = decrypt_config.iv();
   subsamples_ = decrypt_config.subsamples();
 }
 
 }  // namespace media