feat(lang): added "context" to BaseException

modules/angular2/src/core/application.ts

@@ -145,6 +145,11 @@ function _createNgZone(givenReporter: Function): NgZone {
   var defaultErrorReporter = (exception, stackTrace) => {
     var longStackTrace = ListWrapper.join(stackTrace, "\n\n-----async gap-----\n");
     DOM.logError(`${exception}\n\n${longStackTrace}`);
+
+    if (exception instanceof BaseException && isPresent(exception.context)) {
+      print("Error Context:");
+      print(exception.context);
+    }
     throw exception;
   };
 

modules/angular2/src/facade/lang.dart

@@ -183,11 +183,12 @@ class FunctionWrapper {
 }
 
 class BaseException extends Error {
+  final dynamic context;
   final String message;
   final originalException;
   final originalStack;
 
-  BaseException([this.message, this.originalException, this.originalStack]);
+  BaseException([this.message, this.originalException, this.originalStack, this.context]);
 
   String toString() {
     return this.message;

modules/angular2/src/facade/lang.ts

@@ -11,11 +11,18 @@ export function getTypeNameForDebugging(type: Type): string {
 
 export class BaseException extends Error {
   stack;
-  constructor(public message?: string, public originalException?, public originalStack?) {
+  constructor(public message?: string, private _originalException?, private _originalStack?,
+              private _context?) {
     super(message);
     this.stack = (<any>new Error(message)).stack;
   }
 
+  get originalException(): any { return this._originalException; }
+
+  get originalStack(): any { return this._originalStack; }
+
+  get context(): any { return this._context; }
+
   toString(): string { return this.message; }
 }
 
@@ -118,7 +125,9 @@ export function stringify(token): string {
     return token.name;
   }
 
-  return token.toString();
+  var res = token.toString();
+  var newLineIndex = res.indexOf("\n");
+  return (newLineIndex === -1) ? res : res.substring(0, newLineIndex);
 }
 
 export class StringWrapper {