Add string encoding to wire protocol

runtime/include/dart_debugger_api.h

 // Copyright (c) 2011, 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 INCLUDE_DART_DEBUGGER_API_H_
 #define INCLUDE_DART_DEBUGGER_API_H_
 
 #include "include/dart_api.h"
 
 typedef struct _Dart_Breakpoint* Dart_Breakpoint;
@@ skipping 64 matching lines @@
  * given library.
  *
  * Requires there to be a current isolate.
  *
  * \return A handle to a list of string handles.
  */
 DART_EXPORT Dart_Handle Dart_GetScriptURLs(Dart_Handle library_url);
 
 
 /**
+ * DEPRECATED --- use Dart_ScriptGetSource
+ *
  * Returns a string containing the source code of the given script
  * in the given library.
  *
  * Requires there to be a current isolate.
  *
  * \return A handle to string containing the source text if no error
  * occurs.
  */
 DART_EXPORT Dart_Handle Dart_GetScriptSource(
                             Dart_Handle library_url_in,
                             Dart_Handle script_url_in);
 
 
 /**
+ * Returns a string containing the source code of the given script
+ * in the given library.
+ *
+ * Requires there to be a current isolate.
+ *
+ * \return A handle to string containing the source text if no error
+ * occurs.
+ */
+DART_EXPORT Dart_Handle Dart_ScriptGetSource(
+                            intptr_t library_id,
+                            Dart_Handle script_url_in);
+
+
+/**
  * Sets a breakpoint at line \line_number in \script_url, or the closest
  * following line (within the same function) where a breakpoint can be set.
  *
  * Requires there to be a current isolate.
  *
  * \return A handle containing the breakpoint id, which is an integer
  * value, or an error object if a breakpoint could not be set.
  */
 DART_EXPORT Dart_Handle Dart_SetBreakpoint(
                             Dart_Handle script_url,
@@ skipping 322 matching lines @@
 * Returns the url of the library \library_id.
 *
 * Requires there to be a current isolate.
 *
 * \return A string handle containing the URL of the library.
 */
 DART_EXPORT Dart_Handle Dart_GetLibraryURL(intptr_t library_id);
 
 
 #endif  // INCLUDE_DART_DEBUGGER_API_H_