Split net/spdy into core and chromium subdirectories.

net/spdy/zero_copy_output_buffer.h

-// Copyright 2017 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 NET_SPDY_ZERO_COPY_OUTPUT_BUFFER_H_
-#define NET_SPDY_ZERO_COPY_OUTPUT_BUFFER_H_
-
-#include <cstdint>
-
-namespace net {
-
-class ZeroCopyOutputBuffer {
- public:
-  virtual ~ZeroCopyOutputBuffer() {}
-
-  // Returns the next available segment of memory to write. Will always return
-  // the same segment until AdvanceWritePtr is called.
-  virtual void Next(char** data, int* size) = 0;
-
-  // After writing to a buffer returned from Next(), the caller should call
-  // this method to indicate how many bytes were written.
-  virtual void AdvanceWritePtr(int64_t count) = 0;
-
-  // Returns the available capacity of the buffer.
-  virtual uint64_t BytesFree() const = 0;
-};
-
-}  // namespace net
-
-#endif  // NET_SPDY_ZERO_COPY_OUTPUT_BUFFER_H_