Patches to support Dart VM patch files in dart2js.

sdk/lib/core/errors.dart

Index: sdk/lib/core/errors.dart
diff --git a/sdk/lib/core/errors.dart b/sdk/lib/core/errors.dart
index a47838bb0e700a436e9c062a0d1f2f1ee9046426..b799e00b1a8a4e9cb31e13ebb6fff7941828616f 100644
--- a/sdk/lib/core/errors.dart
+++ b/sdk/lib/core/errors.dart
@@ -414,6 +414,8 @@ class IndexError extends ArgumentError implements RangeError {
  */
 class FallThroughError extends Error {
   FallThroughError();
+
+  external String toString();
 }
 
 /**
@@ -422,7 +424,7 @@ class FallThroughError extends Error {
 class AbstractClassInstantiationError extends Error {
   final String _className;
   AbstractClassInstantiationError(String this._className);
-  String toString() => "Cannot instantiate abstract class: '$_className'";
+  external String toString();
 }
 
 
@@ -459,16 +461,20 @@ class NoSuchMethodError extends Error {
    * the signature of the method that would have been called if the parameters
    * had matched.
    */
-  NoSuchMethodError(Object receiver,
-                    Symbol memberName,
-                    List positionalArguments,
-                    Map<Symbol ,dynamic> namedArguments,
-                    [List existingArgumentNames = null])
-      : _receiver = receiver,
-        _memberName = memberName,
-        _arguments = positionalArguments,
-        _namedArguments = namedArguments,
-        _existingArgumentNames = existingArgumentNames;
+  external NoSuchMethodError(
+      this._receiver,
+      this._memberName,
+      this._arguments,
+      this._namedArguments,
+      [List existingArgumentNames = null]);
+
+  external NoSuchMethodError._withType(
+      Object this._receiver,
+      /*String|Symbol*/ memberName,
+      int invocation_type,
+      List this._arguments,
+      Map<dynamic, dynamic> namedArguments,
+      [List existingArgumentNames = null]);
 
   external String toString();
 }