fix(exception_handler): log errors via console.error

This is e.g. needed as we use this to test for errors
in our examples.

modules/angular2/src/core/application.js

@@ -134,7 +134,7 @@ function _injectorBindings(appComponentType): List<Binding> {
 function _createVmZone(givenReporter:Function): VmTurnZone {
   var defaultErrorReporter = (exception, stackTrace) => {
     var longStackTrace = ListWrapper.join(stackTrace, "\n\n-----async gap-----\n");
-    print(`${exception}\n\n${longStackTrace}`);
+    DOM.logError(`${exception}\n\n${longStackTrace}`);
     throw exception;
   };
 

modules/angular2/src/core/exception_handler.js

@@ -1,6 +1,7 @@
 import {Injectable} from 'angular2/di';
 import {isPresent, print} from 'angular2/src/facade/lang';
 import {ListWrapper, isListLikeIterable} from 'angular2/src/facade/collection';
+import {DOM} from 'angular2/src/dom/dom_adapter';
 
 /**
  * Provides a hook for centralized exception handling.
@@ -36,6 +37,6 @@ export class ExceptionHandler {
   call(error, stackTrace = null, reason = null) {
     var longStackTrace = isListLikeIterable(stackTrace) ? ListWrapper.join(stackTrace, "\n\n") : stackTrace;
     var reasonStr = isPresent(reason) ? `\n${reason}` : '';
-    print(`${error}${reasonStr}\nSTACKTRACE:\n${longStackTrace}`);
+    DOM.logError(`${error}${reasonStr}\nSTACKTRACE:\n${longStackTrace}`);
   }
 }

modules/angular2/src/dom/browser_adapter.dart

@@ -100,6 +100,10 @@ class BrowserDomAdapter extends GenericBrowserDomAdapter {
     setRootDomAdapter(new BrowserDomAdapter());
   }
 
+  logError(error) {
+    window.console.error(error);
+  }
+
   @override
   Map<String, String> get attrToPropMap => const <String, String>{
     'innerHtml': 'innerHtml',

modules/angular2/src/dom/browser_adapter.es6

@@ -57,6 +57,10 @@ export class BrowserDomAdapter extends GenericBrowserDomAdapter {
     setRootDomAdapter(new BrowserDomAdapter());
   }
 
+  logError(error) {
+    window.console.error(error);
+  }
+
   get attrToPropMap() {
     return _attrToPropMap;
   }

modules/angular2/src/dom/dom_adapter.js

@@ -16,6 +16,10 @@ function _abstract() {
 @ABSTRACT()
 export class DomAdapter {
 
+  logError(error) {
+    throw _abstract();
+  }
+
   /**
    * Maps attribute names to their corresponding property names for cases
    * where attribute name doesn't match property name.

modules/angular2/src/dom/html_adapter.dart

@@ -3,12 +3,17 @@ library angular2.dom.htmlAdapter;
 import 'dom_adapter.dart';
 import 'package:html/parser.dart' as parser;
 import 'package:html/dom.dart';
+import 'dart:io';
 
 class Html5LibDomAdapter implements DomAdapter {
   static void makeCurrent() {
     setRootDomAdapter(new Html5LibDomAdapter());
   }
 
+  logError(error) {
+    stderr.writeln('${error}');
+  }
+
   @override
   final attrToPropMap = const {
     'innerHtml': 'innerHtml',

modules/angular2/src/dom/parse5_adapter.cjs

@@ -28,6 +28,10 @@ export class Parse5DomAdapter extends DomAdapter {
     setRootDomAdapter(new Parse5DomAdapter());
   }
 
+  logError(error) {
+    console.error(error);
+  }
+
   get attrToPropMap() {
     return _attrToPropMap;
   }