Revert "Remove dead view code"

packages/ember-views/lib/views/view.js

@@ -3,6 +3,9 @@
 // Ember.ContainerView circular dependency
 // Ember.ENV
 import Ember from 'ember-metal/core';
+
+import Evented from "ember-runtime/mixins/evented";
+import EmberObject from "ember-runtime/system/object";
 import EmberError from "ember-metal/error";
 import { get } from "ember-metal/property_get";
 import run from "ember-metal/run_loop";
@@ -900,6 +903,21 @@ var View = CoreView.extend(
     return this.currentState.rerender(this);
   },
 
+  /**
+    Given a property name, returns a dasherized version of that
+    property name if the property evaluates to a non-falsy value.
+
+    For example, if the view has property `isUrgent` that evaluates to true,
+    passing `isUrgent` to this method will return `"is-urgent"`.
+
+    @method _classStringForProperty
+    @param property
+    @private
+  */
+  _classStringForProperty: function(parsedPath) {
+    return View._classStringForValue(parsedPath.path, parsedPath.stream.value(), parsedPath.className, parsedPath.falsyClassName);
+  },
+
   // ..........................................................
   // ELEMENT SUPPORT
   //
@@ -1362,6 +1380,20 @@ deprecateProperty(View.prototype, 'states', '_states');
   // once the view has been inserted into the DOM, legal manipulations
   // are done on the DOM element.
 
+var mutation = EmberObject.extend(Evented).create();
+// TODO MOVE TO RENDERER HOOKS
+View.addMutationListener = function(callback) {
+  mutation.on('change', callback);
+};
+
+View.removeMutationListener = function(callback) {
+  mutation.off('change', callback);
+};
+
+View.notifyMutationListeners = function() {
+  mutation.trigger('change');
+};
+
 /**
   Global views hash