win: Newly created window should also be aware of application menu.

browser/api/lib/app.coffee

@@ -15,6 +15,9 @@ app.getBrowserWindows = ->
 app.setApplicationMenu = (menu) ->
   require('menu').setApplicationMenu menu
 
+app.getApplicationMenu = ->
+  require('menu').getApplicationMenu()
+
 app.commandLine =
   appendSwitch: bindings.appendSwitch,
   appendArgument: bindings.appendArgument

browser/api/lib/browser-window.coffee

@@ -5,6 +5,12 @@ v8Util = process.atomBinding 'v8_util'
 BrowserWindow = process.atomBinding('window').BrowserWindow
 BrowserWindow::__proto__ = EventEmitter.prototype
 
+BrowserWindow::_init = ->
+  # Simulate the application menu on platforms other than OS X.
+  if process.platform isnt 'darwin'
+    menu = app.getApplicationMenu()
+    @setMenu menu if menu?
+
 BrowserWindow::toggleDevTools = ->
   opened = v8Util.getHiddenValue this, 'devtoolsOpened'
   if opened

browser/api/lib/menu.coffee

@@ -55,6 +55,8 @@ Menu.setApplicationMenu = (menu) ->
     windows = app.getBrowserWindows()
     w.setMenu menu for w in windows
 
+Menu.getApplicationMenu = -> applicationMenu
+
 Menu.sendActionToFirstResponder = bindings.sendActionToFirstResponder
 
 Menu.buildFromTemplate = (template) ->