Add ignoreAllErrors option to dart:_runtime

pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/errors.dart

 // Copyright (c) 2015, 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.
 part of dart._runtime;
 
 // We need to set these properties while the sdk is only partially initialized
 // so we cannot use regular Dart fields.
 // The default values for these properties are set when the global_ final field
 // in runtime.dart is initialized.
 
 // Override, e.g., for testing
 void trapRuntimeErrors(bool flag) {
   JS('', 'dart.__trapRuntimeErrors = #', flag);
 }
 
 void ignoreWhitelistedErrors(bool flag) {
   JS('', 'dart.__ignoreWhitelistedErrors = #', flag);
 }
 
+void ignoreAllErrors(bool flag) {
+  JS('', 'dart.__ignoreAllErrors = #', flag);
+}
+
 /// Throw an exception on `is` checks that would return an unsound answer in
 /// non-strong mode Dart.
 ///
 /// For example `x is List<int>` where `x = <Object>['hello']`.
 ///
 /// These checks behave correctly in strong mode (they return false), however,
 /// they will produce a different answer if run on a platform without strong
 /// mode. As a debugging feature, these checks can be configured to throw, to
 /// avoid seeing different behavior between modes.
 ///
@@ skipping 76 matching lines @@
 })()''');
 
 throwNoSuchMethodError(
         receiver, memberName, positionalArguments, namedArguments) =>
     JS(
         '',
         '''(() => {
   if (dart.__trapRuntimeErrors) debugger;
   $throw_(new $NoSuchMethodError($receiver, $memberName, $positionalArguments, $namedArguments));
 })()''');