New Added client-side Sentry logging

Using Raven.js allows logging client-side javascript errors to the
configured Sentry server.

htdocs/includes/raven-js/plugins/backbone.js

@@ -0,0 +1,55 @@
+/**
+ * Backbone.js plugin
+ *
+ * Patches Backbone.Events callbacks.
+ */
+;(function(window, Raven, Backbone) {
+'use strict';
+
+// quit if Backbone isn't on the page
+if (!Backbone) {
+    return;
+}
+
+function makeBackboneEventsOn(oldOn) {
+  return function BackboneEventsOn(name, callback, context) {
+    var wrapCallback = function (cb) {
+      if (Object.prototype.toString.call(cb) === '[object Function]') {
+        var _callback = cb._callback || cb;
+        cb = Raven.wrap(cb);
+        cb._callback = _callback;
+      }
+      return cb;
+    };
+    if (Object.prototype.toString.call(name) === '[object Object]') {
+      // Handle event maps.
+      for (var key in name) {
+        if (name.hasOwnProperty(key)) {
+          name[key] = wrapCallback(name[key]);
+        }
+      }
+    } else {
+      callback = wrapCallback(callback);
+    }
+    return oldOn.call(this, name, callback, context);
+  };
+}
+
+// We're too late to catch all of these by simply patching Backbone.Events.on
+var affectedObjects = [
+  Backbone.Events,
+  Backbone,
+  Backbone.Model.prototype,
+  Backbone.Collection.prototype,
+  Backbone.View.prototype,
+  Backbone.Router.prototype,
+  Backbone.History.prototype
+], i = 0, l = affectedObjects.length;
+
+for (; i < l; i++) {
+  var affected = affectedObjects[i];
+  affected.on = makeBackboneEventsOn(affected.on);
+  affected.bind = affected.on;
+}
+
+}(window, window.Raven, window.Backbone));