Add ignoreAllErrors option to dart:_runtime

pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.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.
 
 /// This library defines runtime operations on objects used by the code
 /// generator.
 part of dart._runtime;
 
 class InvocationImpl extends Invocation {
   final Symbol memberName;
@@ skipping 493 matching lines @@
 instanceOf(obj, type) => JS(
     '',
     '''(() => {
   if ($obj == null) {
     return $type == $Null || $_isTop($type);
   }
   let result = $strongInstanceOf($obj, $type);
   if (result !== null) return result;
   if (!dart.__failForWeakModeIsChecks) return false;
   let actual = $getReifiedType($obj);
-  $throwStrongModeError('Strong mode is-check failure: ' +
-    $typeName(actual) + ' does not soundly subtype ' +
-    $typeName($type));
+  let message = 'Strong mode is-check failure: ' +
+      $typeName(actual) + ' does not soundly subtype ' +
+      $typeName($type);
+  if (!dart.__ignoreAllErrors) {
+    $throwStrongModeError(message);
+  }
+  console.error(message);
+  return true; // Match Dart 1.0 Semantics when ignoring errors.
 })()''');
 
 @JSExportName('as')
 cast(obj, type) {
   if (JS('bool', '# == #', type, dynamic) || obj == null) return obj;
   bool result = strongInstanceOf(obj, type, true);
   if (JS('bool', '#', result)) return obj;
-  _throwCastError(obj, type, result);
+  if (JS('bool', '!dart.__ignoreAllErrors')) {
+    _throwCastError(obj, type, result);
+  }
+  JS('', 'console.error(#)',
+      'Actual: ${typeName(getReifiedType(obj))} Expected: ${typeName(type)}');
+  return obj;
 }
 
 check(obj, type) {
   if (JS('bool', '# == #', type, dynamic) || obj == null) return obj;
   bool result = strongInstanceOf(obj, type, true);
   if (JS('bool', '#', result)) return obj;
-  _throwTypeError(obj, type, result);
+  if (JS('bool', '!dart.__ignoreAllErrors')) {
+    _throwTypeError(obj, type, result);
+  }
+  JS('', 'console.error(#)',
+      'Actual: ${typeName(getReifiedType(obj))} Expected: ${typeName(type)}');
+  return obj;
 }
 
 bool test(obj) {
   if (obj is bool) return obj;
   return booleanConversionFailed(obj);
 }
 
 bool booleanConversionFailed(obj) {
   if (obj == null) {
     throw new BooleanConversionAssertionError();
@@ skipping 453 matching lines @@
     name = '+' + name;
   }
   return name;
 }
 
 /// Emulates the implicit "loadLibrary" function provided by a deferred library.
 ///
 /// Libraries are not actually deferred in DDC, so this just returns a future
 /// that completes immediately.
 Future loadLibrary() => new Future.value();