Adds a ParseTrailers method to SpdyUtils, with some basic validation of the header keys provided.

net/quic/spdy_utils.h

 // Copyright (c) 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_QUIC_SPDY_UTILS_H_
 #define NET_QUIC_SPDY_UTILS_H_
 
 #include <map>
 #include <string>
 
@@ skipping 11 matching lines @@
   // Parses |data| as a std::string containing serialized HTTP/2 HEADERS frame,
   // populating |headers| with the key->value std:pairs found.
   // |content_length| will be populated with the value of the content-length
   // header if one or more are present.
   // Returns true on success, false if parsing fails, or invalid keys are found.
   static bool ParseHeaders(const char* data,
                            uint32 data_len,
                            int* content_length,
                            SpdyHeaderBlock* headers);
 
+  // Parses |data| as a std::string containing serialized HTTP/2 HEADERS frame,
+  // populating |trailers| with the key->value std:pairs found.
+  // The :final-offset header will be excluded from |trailers|, and instead the
+  // value will be copied to |final_byte_offset|.
+  // Returns true on success, false if parsing fails, or invalid keys are found.
+  static bool ParseTrailers(const char* data,
+                            uint32 data_len,
+                            size_t* final_byte_offset,
+                            SpdyHeaderBlock* trailers);
+
  private:
   DISALLOW_COPY_AND_ASSIGN(SpdyUtils);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_SPDY_UTILS_H_