Split dart:builtin into dart:builtin and dart:io.

runtime/bin/dartutils.cc

 // 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.
 
 #include "bin/dartutils.h"
 
 #include "bin/file.h"
 #include "platform/assert.h"
 #include "platform/globals.h"
 
 const char* DartUtils::kDartScheme = "dart:";
 const char* DartUtils::kBuiltinLibURL = "dart:builtin";
 const char* DartUtils::kCoreLibURL = "dart:core";
 const char* DartUtils::kCoreImplLibURL = "dart:coreimpl";
-const char* DartUtils::kCoreNativeWrappersLibURL = "dart:nativewrappers";
+const char* DartUtils::kIOLibURL = "dart:io";
+const char* DartUtils::kNativeWrappersLibURL = "dart:nativewrappers";
+
+
 const char* DartUtils::kIdFieldName = "_id";
 
 
 static const char* MapLibraryUrl(CommandLineOptions* url_mapping,
                                  const char* url_string) {
   ASSERT(url_mapping != NULL);
   // We need to check if the passed in url is found in the url_mapping array,
   // in that case use the mapped entry.
   int len = strlen(url_string);
   for (int idx = 0; idx < url_mapping->count(); idx++) {
@@ skipping 188 matching lines @@
            path, File::PathSeparator(), filename);
 
   free(path);
   char* canonical_filename = File::GetCanonicalPath(absolute_filename);
   if (canonical_filename == NULL) {
     return absolute_filename;
   }
   free(absolute_filename);
   return canonical_filename;
 }