fix(exception_handler): fix error messages of wrapped exceptions

Closes #4117

modules/angular2/src/core/facade/exceptions.ts

@@ -0,0 +1,45 @@
+/// <reference path="../../../manual_typings/globals.d.ts" />
+
+import {ExceptionHandler} from './exception_handler';
+
+export {ExceptionHandler} from './exception_handler';
+
+export class BaseException extends Error {
+  public stack: any;
+  constructor(public message?: string) {
+    super(message);
+    this.stack = (<any>new Error(message)).stack;
+  }
+
+  toString(): string { return this.message; }
+}
+
+export class WrappedException extends Error {
+  private _wrapperStack: any;
+
+  constructor(private _wrapperMessage: string, private _originalException, private _originalStack?,
+              private _context?) {
+    super(_wrapperMessage);
+    this._wrapperStack = (<any>new Error(_wrapperMessage)).stack;
+  }
+
+  get wrapperMessage(): string { return this._wrapperMessage; }
+
+  get wrapperStack(): any { return this._wrapperStack; }
+
+
+  get originalException(): any { return this._originalException; }
+
+  get originalStack(): any { return this._originalStack; }
+
+
+  get context(): any { return this._context; }
+
+  get message(): string { return ExceptionHandler.exceptionToString(this); }
+
+  toString(): string { return this.message; }
+}
+
+export function makeTypeError(message?: string): Error {
+  return new TypeError(message);
+}