Throw TypeError instead of CastError for type coercions.

tool/input_sdk/private/ddc_runtime/errors.dart

Index: tool/input_sdk/private/ddc_runtime/errors.dart
diff --git a/tool/input_sdk/private/ddc_runtime/errors.dart b/tool/input_sdk/private/ddc_runtime/errors.dart
index 12436155ad87c3b1d496dcea2e2796455e44e3fc..c537c33a2c86ae96dc5ebc4633f67e3314e72dff 100644
--- a/tool/input_sdk/private/ddc_runtime/errors.dart
+++ b/tool/input_sdk/private/ddc_runtime/errors.dart
@@ -3,11 +3,30 @@
 // BSD-style license that can be found in the LICENSE file.
 part of dart._runtime;
 
-throwCastError(actual, type) => JS('', '''(() => {
-  $throw_(new $CastErrorImplementation($typeName($actual),
+throwCastError(object, actual, type) => JS('', '''(() => {
+  $throw_(new $CastErrorImplementation($object,
+                                       $typeName($actual),
                                        $typeName($type)));
 })()''');
 
+throwTypeError(object, actual, type) => JS('', '''(() => {
+  $throw_(new $TypeErrorImplementation($object,
+                                       $typeName($actual),
+                                       $typeName($type)));
+})()''');
+
+throwStrongModeCastError(object, actual, type) => JS('', '''(() => {
+  $throw_(new $StrongModeCastError($object,
+                                   $typeName($actual),
+                                   $typeName($type)));
+})()''');
+
+throwStrongModeTypeError(object, actual, type) => JS('', '''(() => {
+  $throw_(new $StrongModeTypeError($object,
+                                   $typeName($actual),
+                                   $typeName($type)));
+})()''');
+
 throwAssertionError() => JS('', '''(() => {
   $throw_(new $AssertionError());
 })()''');