diff -r 000000000000 -r 6474c204b198 b2g/chrome/content/desktop.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/b2g/chrome/content/desktop.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,79 @@
+/* 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/. */
+
+// Enable touch event shim on desktop that translates mouse events
+// into touch ones
+function enableTouch() {
+  let require = Cu.import('resource://gre/modules/devtools/Loader.jsm', {})
+                  .devtools.require;
+  let { TouchEventHandler } = require('devtools/touch-events');
+  let chromeEventHandler = window.QueryInterface(Ci.nsIInterfaceRequestor)
+                                 .getInterface(Ci.nsIWebNavigation)
+                                 .QueryInterface(Ci.nsIDocShell)
+                                 .chromeEventHandler || window;
+  let touchEventHandler = new TouchEventHandler(chromeEventHandler);
+  touchEventHandler.start();
+}
+
+function setupButtons() {
+  let homeButton = document.getElementById('home-button');
+  if (!homeButton) {
+    // The toolbar only exists in b2g desktop build with
+    // FXOS_SIMULATOR turned on.
+    return;
+  }
+  // The touch event helper is enabled on shell.html document,
+  // so that click events are delayed and it is better to
+  // listen for touch events.
+  homeButton.addEventListener('touchstart', function() {
+    shell.sendChromeEvent({type: 'home-button-press'});
+    homeButton.classList.add('active');
+  });
+  homeButton.addEventListener('touchend', function() {
+    shell.sendChromeEvent({type: 'home-button-release'});
+    homeButton.classList.remove('active');
+  });
+
+  Cu.import("resource://gre/modules/GlobalSimulatorScreen.jsm");
+  let rotateButton = document.getElementById('rotate-button');
+  rotateButton.addEventListener('touchstart', function () {
+    rotateButton.classList.add('active');
+  });
+  rotateButton.addEventListener('touchend', function() {
+    GlobalSimulatorScreen.flipScreen();
+    rotateButton.classList.remove('active');
+  });
+}
+
+function checkDebuggerPort() {
+  // XXX: To be removed once bug 942756 lands.
+  // We are hacking 'unix-domain-socket' pref by setting a tcp port (number).
+  // DebuggerServer.openListener detects that it isn't a file path (string),
+  // and starts listening on the tcp port given here as command line argument.
+
+  if (!window.arguments) {
+    return;
+  }
+
+  // Get the command line arguments that were passed to the b2g client
+  let args = window.arguments[0].QueryInterface(Ci.nsICommandLine);
+
+  let dbgport;
+  try {
+    dbgport = args.handleFlagWithParam('start-debugger-server', false);
+  } catch(e) {}
+
+  if (dbgport) {
+    dump('Opening debugger server on ' + dbgport + '\n');
+    Services.prefs.setCharPref('devtools.debugger.unix-domain-socket', dbgport);
+    navigator.mozSettings.createLock().set(
+      {'debugger.remote-mode': 'adb-devtools'});
+  }
+}
+
+window.addEventListener('ContentStart', function() {
+  enableTouch();
+  setupButtons();
+  checkDebuggerPort();
+});