Log compressed size of HTTP/2 requests.

net/spdy/spdy_headers_handler_interface.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 NET_SPDY_SPDY_HEADERS_HANDLER_INTERFACE_H_
 #define NET_SPDY_SPDY_HEADERS_HANDLER_INTERFACE_H_
 
 #include <stddef.h>
 
 #include "base/strings/string_piece.h"
 #include "net/base/net_export.h"
 
 namespace net {
 
 // This interface defines how an object that accepts header data should behave.
 // It is used by both SpdyHeadersBlockParser and HpackDecoder.
 class NET_EXPORT_PRIVATE SpdyHeadersHandlerInterface {
  public:
   virtual ~SpdyHeadersHandlerInterface() {}
 
   // A callback method which notifies when the parser starts handling a new
   // header block. Will only be called once per block, even if it extends into
   // CONTINUATION frames.
   virtual void OnHeaderBlockStart() = 0;
 
   // A callback method which notifies on a header key value pair. Multiple
   // values for a given key will be emitted as multiple calls to OnHeader.
   virtual void OnHeader(base::StringPiece key, base::StringPiece value) = 0;
 
+  // TODO(yasong): deprecate this method with
+  // --gfe2_reloadable_flag_log_compressed_size.
+  // A callback method which notifies when the parser finishes handling a
+  // header block (i.e. the containing frame has the END_HEADERS flag set).
+  // Also indicates the total number of bytes in this block.
+  virtual void OnHeaderBlockEnd(size_t uncompressed_header_bytes) = 0;
+
   // A callback method which notifies when the parser finishes handling a
   // header block (i.e. the containing frame has the END_HEADERS flag set).
   // Also indicates the total number of bytes in this block.
-  virtual void OnHeaderBlockEnd(size_t uncompressed_header_bytes) = 0;
+  virtual void OnHeaderBlockEnd(size_t uncompressed_header_bytes,
+                                size_t compressed_header_bytes) = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_SPDY_HEADERS_HANDLER_INTERFACE_H_