Add helper function for SPDY 4

net/spdy/spdy_framer.h

 // Copyright (c) 2012 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_FRAMER_H_
 #define NET_SPDY_SPDY_FRAMER_H_
 
 #include <list>
 #include <map>
 #include <string>
@@ skipping 470 matching lines @@
   size_t GetSynStreamMinimumSize() const;
   size_t GetSynReplyMinimumSize() const;
   size_t GetRstStreamSize() const;
   size_t GetSettingsMinimumSize() const;
   size_t GetPingSize() const;
   size_t GetGoAwaySize() const;
   size_t GetHeadersMinimumSize() const;
   size_t GetWindowUpdateSize() const;
   size_t GetCredentialMinimumSize() const;
 
+  // Returns the maximum payload size of a DATA frame.
+  size_t GetDataFrameMaximumPayload() const;
+
   // For debugging.
   static const char* StateToString(int state);
   static const char* ErrorCodeToString(int error_code);
   static const char* StatusCodeToString(int status_code);
   static const char* ControlTypeToString(SpdyControlType type);
 
   int protocol_version() const { return spdy_version_; }
 
   bool probable_http_response() const { return probable_http_response_; }
 
@@ skipping 178 matching lines @@
   // starts with HTTP.  If it does, we likely have an HTTP response.   This
   // isn't guaranteed though: we could have gotten a settings frame and then
   // corrupt data that just looks like HTTP, but deterministic checking requires
   // a lot more state.
   bool probable_http_response_;
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_SPDY_FRAMER_H_