Bug 1178484 - Part 4: Fire metachange event when a <meta> tag has Ope…

…n Graph data. r=kanru

dom/browser-element/BrowserElementChildPreload.js

@@ -569,33 +569,42 @@ BrowserElementChild.prototype = {
       return;
     }
 
-    if (!e.target.name) {
+    var name = e.target.name;
+    var property = e.target.getAttributeNS(null, "property");
+
+    if (!name && !property) {
       return;
     }
 
-    debug('Got metaChanged: (' + e.target.name + ') ' + e.target.content);
+    debug('Got metaChanged: (' + (name || property) + ') ' +
+          e.target.content);
 
     let handlers = {
-      'viewmode': this._genericMetaHandler.bind(null, 'viewmode'),
-      'theme-color': this._genericMetaHandler.bind(null, 'theme-color'),
-      'theme-group': this._genericMetaHandler.bind(null, 'theme-group'),
+      'viewmode': this._genericMetaHandler,
+      'theme-color': this._genericMetaHandler,
+      'theme-group': this._genericMetaHandler,
       'application-name': this._applicationNameChangedHandler
     };
+    let handler = handlers[name];
+
+    if ((property || name).match(/^og:/)) {
+      name = property || name;
+      handler = this._genericMetaHandler;
+    }
 
-    let handler = handlers[e.target.name];
     if (handler) {
-      handler(e.type, e.target);
+      handler(name, e.type, e.target);
     }
   },
 
-  _applicationNameChangedHandler: function(eventType, target) {
+  _applicationNameChangedHandler: function(name, eventType, target) {
     if (eventType !== 'DOMMetaAdded') {
       // Bug 1037448 - Decide what to do when <meta name="application-name">
       // changes
       return;
     }
 
-    let meta = { name: 'application-name',
+    let meta = { name: name,
                  content: target.content };
 
     let lang;