perf(ngBindHtml): watch the original value and sanitize later

Author: chirayuk

src/ng/directive/ngBind.js

@@ -136,8 +136,8 @@ var ngBindTemplateDirective = ['$interpolate', function($interpolate) {
 var ngBindHtmlDirective = ['$sce', function($sce) {
   return function(scope, element, attr) {
     element.addClass('ng-binding').data('$binding', attr.ngBindHtml);
-    scope.$watch($sce.parseAsHtml(attr.ngBindHtml), function ngBindHtmlWatchAction(value) {
-      element.html(value || '');
+    scope.$watch(attr.ngBindHtml, function ngBindHtmlWatchAction(value) {
+      element.html($sce.getTrustedHtml(value) || '');
     });
   };
 }];