isolates refactor: this change introduces 'dart:isolate' as a library. This is a

runtime/bin/dartutils.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_DARTUTILS_H_
 #define BIN_DARTUTILS_H_
 
 #include "bin/builtin.h"
 #include "include/dart_api.h"
 #include "platform/globals.h"
@@ skipping 77 matching lines @@
 
   static const char* kDartScheme;
   static const char* kDartExtensionScheme;
   static const char* kBuiltinLibURL;
   static const char* kCoreLibURL;
   static const char* kCoreImplLibURL;
   static const char* kIOLibURL;
   static const char* kJsonLibURL;
   static const char* kUriLibURL;
   static const char* kUtf8LibURL;
+  static const char* kIsolateLibURL;
 
   static const char* kIdFieldName;
 
  private:
   static const char* GetCanonicalPath(const char* reference_dir,
                                       const char* filename);
 
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(DartUtils);
 };
@@ skipping 162 matching lines @@
 
 class CObjectByteArray : public CObject {
  public:
   DECLARE_COBJECT_CONSTRUCTORS(ByteArray)
 
   int Length() const { return cobject_->value.as_byte_array.length; }
   uint8_t* Buffer() const { return cobject_->value.as_byte_array.values; }
 };
 
 #endif  // BIN_DARTUTILS_H_