Bug 1067576 - Make console.log work in frame scripts (r=Mossop)

toolkit/components/processsingleton/MainProcessSingleton.js

@@ -0,0 +1,53 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const Cu = Components.utils;
+const Ci = Components.interfaces;
+const Cc = Components.classes;
+
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+XPCOMUtils.defineLazyServiceGetter(this, "ppmm",
+                                   "@mozilla.org/parentprocessmessagemanager;1",
+                                   "nsIMessageListenerManager");
+
+XPCOMUtils.defineLazyServiceGetter(this, "globalmm",
+                                   "@mozilla.org/globalmessagemanager;1",
+                                   "nsIMessageBroadcaster");
+
+function MainProcessSingleton() {}
+MainProcessSingleton.prototype = {
+  classID: Components.ID("{0636a680-45cb-11e4-916c-0800200c9a66}"),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver,
+                                         Ci.nsISupportsWeakReference]),
+
+  receiveMessage: function(message) {
+    let logMsg = message.data;
+    logMsg.wrappedJSObject = logMsg;
+    Services.obs.notifyObservers(logMsg, "console-api-log-event", null);
+  },
+
+  observe: function(subject, topic, data) {
+    switch (topic) {
+    case "app-startup": {
+      Services.obs.addObserver(this, "xpcom-shutdown", false);
+
+      // Load this script early so that console.* is initialized
+      // before other frame scripts.
+      globalmm.loadFrameScript("chrome://global/content/browser-content.js", true);
+      ppmm.addMessageListener("Console:Log", this);
+      break;
+    }
+
+    case "xpcom-shutdown":
+      ppmm.removeMessageListener("Console:Log", this);
+      break;
+    }
+  },
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([MainProcessSingleton]);