Bug 942244 - [Australis] Add BrowserUiTelemetry module for collecting toolbar measurements. r=dao.

browser/components/nsBrowserGlue.js

@@ -79,6 +79,9 @@ XPCOMUtils.defineLazyModuleGetter(this, "OS",
 XPCOMUtils.defineLazyModuleGetter(this, "SessionStore",
                                   "resource:///modules/sessionstore/SessionStore.jsm");
 
+XPCOMUtils.defineLazyModuleGetter(this, "BrowserUITelemetry",
+                                  "resource:///modules/BrowserUITelemetry.jsm");
+
 const PREF_PLUGINS_NOTIFYUSER = "plugins.update.notifyUser";
 const PREF_PLUGINS_UPDATEURL  = "plugins.update.url";
 
@@ -476,6 +479,7 @@ BrowserGlue.prototype = {
     webrtcUI.init();
     AboutHome.init();
     SessionStore.init();
+    BrowserUITelemetry.init();
 
     if (Services.prefs.getBoolPref("browser.tabs.remote"))
       ContentClick.init();

browser/modules/BrowserUITelemetry.jsm

@@ -0,0 +1,43 @@
+// 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";
+
+this.EXPORTED_SYMBOLS = ["BrowserUITelemetry"];
+
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "UITelemetry",
+  "resource://gre/modules/UITelemetry.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "RecentWindow",
+  "resource:///modules/RecentWindow.jsm");
+
+this.BrowserUITelemetry = {
+  init: function() {
+    UITelemetry.addSimpleMeasureFunction("toolbars",
+                                         this.getToolbarMeasures.bind(this));
+  },
+
+  getToolbarMeasures: function() {
+    // Grab the most recent non-popup, non-private browser window for us to
+    // analyze the toolbars in...
+    let win = RecentWindow.getMostRecentBrowserWindow({
+      private: false,
+      allowPopups: false
+    });
+
+    // If there are no such windows, we're out of luck. :(
+    if (!win) {
+      return {};
+    }
+
+    let document = win.document;
+    let result = {};
+
+    return result;
+  },
+};

browser/modules/moz.build

@@ -8,6 +8,7 @@ TEST_DIRS += ['test']
 
 EXTRA_JS_MODULES += [
     'BrowserNewTabPreloader.jsm',
+    'BrowserUITelemetry.jsm',
     'CharsetMenu.jsm',
     'ContentClick.jsm',
     'NetworkPrioritizer.jsm',