Add FallThroughError patch

pkg/dev_compiler/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,
@@ skipping 147 matching lines @@
     return jsonEncodeNative(string);
   }
 
   @patch
   StackTrace get stackTrace => Primitives.extractStackTrace(this);
 }
 
 @patch
 class FallThroughError {
   @patch
+  FallThroughError._create(String url, int line);
+
+  @patch
   String toString() => super.toString();
 }
 
 @patch
 class AbstractClassInstantiationError {
   @patch
   String toString() => "Cannot instantiate abstract class: '$_className'";
 }
 
 /// An interface type for all Strong-mode errors.
@@ skipping 477 matching lines @@
   static StackTrace get current {
     return getTraceFromException(JS('', 'new Error()'));
   }
 }
 
 @patch
 class _ConstantExpressionError {
   @patch
   _throw(error) => throw error;
 }