[DevTools] Support multiple DevToolsMessageChunkProcessor instances

content/renderer/devtools/devtools_agent.cc

 // 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.
 
 #include "content/renderer/devtools/devtools_agent.h"
 
 #include <stddef.h>
 
 #include <map>
 
@@ skipping 203 matching lines @@
     chunk.call_id = call_id;
     chunk.post_state = post_state;
     chunk.is_last = true;
     sender->Send(new DevToolsClientMsg_DispatchOnInspectorFrontend(
                      routing_id, chunk));
     return;
   }
 
   for (size_t pos = 0; pos < message.length(); pos += kMaxMessageChunkSize) {
     chunk.is_last = pos + kMaxMessageChunkSize >= message.length();
-    chunk.session_id = chunk.is_last ? session_id : 0;
+    chunk.session_id = session_id;
     chunk.call_id = chunk.is_last ? call_id : 0;
     chunk.post_state = chunk.is_last ? post_state : std::string();
     chunk.data = message.substr(pos, kMaxMessageChunkSize);
     sender->Send(new DevToolsClientMsg_DispatchOnInspectorFrontend(
                      routing_id, chunk));
     chunk.is_first = false;
     chunk.message_size = 0;
   }
 }
 
@@ skipping 106 matching lines @@
   result->Set("errors", errors.release());
   response->Set("result", result.release());
 
   std::string json_message;
   base::JSONWriter::Write(*response, &json_message);
   SendChunkedProtocolMessage(this, routing_id(), session_id, call_id,
                              json_message, std::string());
 }
 
 }  // namespace content