Add string encoding to wire protocol

runtime/bin/dbg_connection.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef BIN_DBG_CONNECTION_H_
 #define BIN_DBG_CONNECTION_H_
 
 #include "bin/builtin.h"
 #include "bin/utils.h"
 
@@ skipping 42 matching lines @@
   static void HandleMessages();
   static void HandleResumeCmd(const char* msg);
   static void HandleStepIntoCmd(const char* msg);
   static void HandleStepOverCmd(const char* msg);
   static void HandleStepOutCmd(const char* msg);
   static void HandleGetLibrariesCmd(const char* json_msg);
   static void HandleGetClassPropsCmd(const char* json_msg);
   static void HandleGetLibPropsCmd(const char* json_msg);
   static void HandleGetObjPropsCmd(const char* json_msg);
   static void HandleGetScriptURLsCmd(const char* json_msg);
+  static void HandleGetSourceCmd(const char* json_msg);
   static void HandleGetStackTraceCmd(const char* json_msg);
   static void HandleSetBpCmd(const char* json_msg);
   static void HandleRemBpCmd(const char* json_msg);
   static void HandleUnknownMsg(const char* json_msg);
 
   static void SendError(int msg_id, const char* err_msg);
 
   // Text buffer that accumulates messages to be sent to front end.
   static dart::TextBuffer queued_messages_;
 
@@ skipping 16 matching lines @@
 
   static MessageBuffer* msgbuf_;
 
   friend class DebuggerConnectionImpl;
 
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(DebuggerConnectionHandler);
 };
 
 #endif  // BIN_DBG_CONNECTION_H_