diff -r 000000000000 -r 6474c204b198 dom/payment/Payment.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/payment/Payment.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,135 @@
+/* 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 {classes: Cc, interfaces: Ci, utils: Cu} = Components;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/DOMRequestHelper.jsm");
+
+const PAYMENTCONTENTHELPER_CID =
+  Components.ID("{a920adc0-c36e-4fd0-8de0-aac1ac6ebbd0}");
+
+const PAYMENT_IPC_MSG_NAMES = ["Payment:Success",
+                               "Payment:Failed"];
+
+const PREF_DEBUG = "dom.payment.debug";
+
+XPCOMUtils.defineLazyServiceGetter(this, "cpmm",
+                                   "@mozilla.org/childprocessmessagemanager;1",
+                                   "nsIMessageSender");
+
+function PaymentContentHelper() {
+};
+
+PaymentContentHelper.prototype = {
+  __proto__: DOMRequestIpcHelper.prototype,
+
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsINavigatorPayment,
+                                         Ci.nsIDOMGlobalPropertyInitializer,
+                                         Ci.nsISupportsWeakReference,
+                                         Ci.nsIObserver]),
+  classID:        PAYMENTCONTENTHELPER_CID,
+  classInfo:      XPCOMUtils.generateCI({
+    classID: PAYMENTCONTENTHELPER_CID,
+    contractID: "@mozilla.org/payment/content-helper;1",
+    classDescription: "Payment Content Helper",
+    flags: Ci.nsIClassInfo.DOM_OBJECT,
+    interfaces: [Ci.nsINavigatorPayment]
+  }),
+
+  // nsINavigatorPayment
+
+  pay: function pay(aJwts) {
+    let request = this.createRequest();
+    let requestId = this.getRequestId(request);
+
+    let docShell = this._window.QueryInterface(Ci.nsIInterfaceRequestor)
+                   .getInterface(Ci.nsIWebNavigation)
+                   .QueryInterface(Ci.nsIDocShell);
+    if (!docShell.isActive) {
+      if (this._debug) {
+        this.LOG("The caller application is a background app. No request " +
+                  "will be sent");
+      }
+      let runnable = {
+        run: function run() {
+          Services.DOMRequest.fireError(request, "BACKGROUND_APP");
+        }
+      }
+      Services.tm.currentThread.dispatch(runnable,
+                                         Ci.nsIThread.DISPATCH_NORMAL);
+      return request;
+    }
+
+    if (!Array.isArray(aJwts)) {
+      aJwts = [aJwts];
+    }
+
+    cpmm.sendAsyncMessage("Payment:Pay", {
+      jwts: aJwts,
+      requestId: requestId
+    });
+    return request;
+  },
+
+  // nsIDOMGlobalPropertyInitializer
+
+  init: function(aWindow) {
+    try {
+      if (!Services.prefs.getBoolPref("dom.mozPay.enabled")) {
+        return null;
+      }
+    } catch (e) {
+      return null;
+    }
+
+    this._window = aWindow;
+    this.initDOMRequestHelper(aWindow, PAYMENT_IPC_MSG_NAMES);
+
+    try {
+      this._debug =
+        Services.prefs.getPrefType(PREF_DEBUG) == Ci.nsIPrefBranch.PREF_BOOL
+        && Services.prefs.getBoolPref(PREF_DEBUG);
+    } catch(e) {
+      this._debug = false;
+    }
+
+    return this.pay.bind(this);
+  },
+
+  // nsIFrameMessageListener
+
+  receiveMessage: function receiveMessage(aMessage) {
+    let name = aMessage.name;
+    let msg = aMessage.json;
+    if (this._debug) {
+      this.LOG("Received message '" + name + "': " + JSON.stringify(msg));
+    }
+    let requestId = msg.requestId;
+    let request = this.takeRequest(requestId);
+    if (!request) {
+      return;
+    }
+    switch (name) {
+      case "Payment:Success":
+        Services.DOMRequest.fireSuccess(request, msg.result);
+        break;
+      case "Payment:Failed":
+        Services.DOMRequest.fireError(request, msg.errorMsg);
+        break;
+    }
+  },
+
+  LOG: function LOG(s) {
+    if (!this._debug) {
+      return;
+    }
+    dump("-*- PaymentContentHelper: " + s + "\n");
+  }
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([PaymentContentHelper]);