Throw TypeError instead of CastError for type coercions.

tool/input_sdk/patch/core_patch.dart

 // 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.
 
 // Patch file for dart:core classes.
 import "dart:_internal" as _symbol_dev;
 import 'dart:_interceptors';
 import 'dart:_js_helper' show patch,
                               checkInt,
                               getRuntimeType,
@@ skipping 131 matching lines @@
 
   @patch
   static String _stringToSafeString(String string) {
     return jsonEncodeNative(string);
   }
 
   @patch
   StackTrace get stackTrace => Primitives.extractStackTrace(this);
 }
 
+/// An interface type for all Strong-mode errors.
+class StrongModeError extends Error {}
+
 // Patch for DateTime implementation.
 @patch
 class DateTime {
   @patch
   DateTime.fromMillisecondsSinceEpoch(int millisecondsSinceEpoch,
                                       {bool isUtc: false})
       : this._withValue(millisecondsSinceEpoch, isUtc: isUtc);
 
   @patch
   DateTime.fromMicrosecondsSinceEpoch(int microsecondsSinceEpoch,
@@ skipping 451 matching lines @@
       return getTraceFromException(error);
     }
     // Fallback if Error.captureStackTrace does not exist.
     try {
       throw '';
     } catch (_, stackTrace) {
       return stackTrace;
     }
   }
 }