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diff --git a/chromium/net/tools/balsa/buffer_interface.h b/chromium/net/tools/balsa/buffer_interface.h
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+++ b/chromium/net/tools/balsa/buffer_interface.h
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+// Copyright 2013 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_TOOLS_BALSA_BUFFER_INTERFACE_H__
+#define NET_TOOLS_BALSA_BUFFER_INTERFACE_H__
+
+namespace net {
+
+class BufferInterface {
+ public:
+
+  //   Returns the bytes which can be read from the buffer.  There is no
+  //   guarantee that the bytes are contiguous.
+  virtual int ReadableBytes() const = 0;
+
+  // Summary:
+  //   returns the size of this buffer
+  // Returns:
+  //   size of this buffer.
+  virtual int BufferSize() const = 0;
+
+  // Summary:
+  //   returns the number of bytes free in this buffer.
+  // Returns:
+  //   number of bytes free.
+  virtual int BytesFree() const = 0;
+
+  // Summary:
+  //   Returns true if empty.
+  // Returns:
+  //   true - if empty
+  //   false - otherwise
+  virtual bool Empty() const = 0;
+
+  // Summary:
+  //   Returns true if the buffer is full.
+  virtual bool Full() const = 0;
+
+  // Summary:
+  //   returns the number of characters written.
+  //   appends up-to-'size' bytes to the buffer.
+  // Args:
+  //   bytes - bytes which are read, and copied into the buffer.
+  //   size  - number of bytes which are read and copied.
+  //           this number shall be >= 0.
+  virtual int Write(const char* bytes, int size) = 0;
+
+  // Summary:
+  //   Gets a pointer which can be written to (assigned to).
+  //   this pointer (and size) can be used in functions like
+  //   recv() or read(), etc.
+  //   If *size is zero upon returning from this function, that it
+  //   is unsafe to dereference *ptr.
+  // Args:
+  //   ptr - assigned a pointer to which we can write
+  //   size - the amount of data (in bytes) that it is safe to write to ptr.
+  virtual void GetWritablePtr(char **ptr, int* size) const = 0;
+
+  // Summary:
+  //   Gets a pointer which can be read from
+  //   this pointer (and size) can be used in functions like
+  //   send() or write(), etc.
+  //   If *size is zero upon returning from this function, that it
+  //   is unsafe to dereference *ptr.
+  // Args:
+  //   ptr - assigned a pointer from which we may read
+  //   size - the amount of data (in bytes) that it is safe to read
+  virtual void GetReadablePtr(char **ptr, int* size) const = 0;
+
+  // Summary:
+  //   Reads bytes out of the buffer, and writes them into 'bytes'.
+  //   Returns the number of bytes read.
+  //   Consumes bytes from the buffer (possibly, but not necessarily
+  //   rendering them free)
+  // Args:
+  //   bytes - the pointer into which bytes are read from this buffer
+  //           and written into
+  //   size  - number of bytes which are read and copied.
+  //           this number shall be >= 0.
+  // Returns:
+  //   the number of bytes read from 'bytes'
+  virtual int Read(char* bytes, int size) = 0;
+
+  // Summary:
+  //   removes all data from the buffer
+  virtual void Clear() = 0;
+
+  // Summary:
+  //   reserves contiguous writable empty space in the buffer of size bytes.
+  //   Returns true if the reservation is successful.
+  //   If a derive class chooses not to implement reservation, its
+  //   implementation should return false.
+  virtual bool Reserve(int size) = 0;
+
+  // Summary:
+  //   removes the oldest 'amount_to_consume' characters from this buffer,
+  // Args:
+  //   amount_to_advance - .. this should be self-explanatory =)
+  //                       this number shall be >= 0.
+  virtual void AdvanceReadablePtr(int amount_to_advance) = 0;
+
+  // Summary:
+  //   Moves the internal pointers around such that the
+  //   amount of data specified here is expected to
+  //   already be resident (as if it was Written)
+  // Args:
+  //   amount_to_advance - self explanatory.
+  //                       this number shall be >= 0.
+  virtual void AdvanceWritablePtr(int amount_to_advance) = 0;
+
+  virtual ~BufferInterface() {}
+
+ protected:
+  BufferInterface() {}
+};
+
+}  // namespace net
+
+#endif  // NET_TOOLS_BALSA_BUFFER_INTERFACE__H__
+