Unify Object implementation across dart2js and VM.

corelib/src/implementation/object.dart

Index: corelib/src/implementation/object.dart
diff --git a/corelib/src/bool.dart b/corelib/src/implementation/object.dart
similarity index 58%
copy from corelib/src/bool.dart
copy to corelib/src/implementation/object.dart
index 1bc75309ee31e1351cdd29cab33041bb6b104468..9ef1fb92b40d787e1043de292dab11f80e8f31b6 100644
--- a/corelib/src/bool.dart
+++ b/corelib/src/implementation/object.dart
@@ -2,7 +2,7 @@
 // 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.
 
-// Dart core library.
-
-interface bool {
+class ObjectImplementation {
+  external static String toStringImpl(Object o);
+  external static void noSuchMethodImpl(Object o, String name, List args);
 }