Add allowpopups attribute for webview

atom/browser/lib/guest-view-manager.coffee

@@ -84,6 +84,8 @@ createGuest = (embedder, params) ->
     if params.allowtransparency?
       @setAllowTransparency params.allowtransparency
 
+    guest.allowPopups = params.allowpopups
+
   # Dispatch events to embedder.
   for event in supportedWebViewEvents
     do (event) ->

atom/browser/lib/guest-window-manager.coffee

@@ -41,7 +41,7 @@ createGuest = (embedder, url, frameName, options) ->
 ipc.on 'ATOM_SHELL_GUEST_WINDOW_MANAGER_WINDOW_OPEN', (event, args...) ->
   [url, frameName, options] = args
   event.sender.emit 'new-window', event, url, frameName, 'new-window'
-  if event.sender.isGuest() or event.defaultPrevented
+  if (event.sender.isGuest() and not event.sender.allowPopups) or event.defaultPrevented
     event.returnValue = null
   else
     event.returnValue = createGuest event.sender, args...

atom/renderer/lib/web-view/web-view-attributes.coffee

@@ -216,6 +216,7 @@ WebViewImpl::setupWebViewAttributes = ->
   @attributes[webViewConstants.ATTRIBUTE_NODEINTEGRATION] = new BooleanAttribute(webViewConstants.ATTRIBUTE_NODEINTEGRATION, this)
   @attributes[webViewConstants.ATTRIBUTE_PLUGINS] = new BooleanAttribute(webViewConstants.ATTRIBUTE_PLUGINS, this)
   @attributes[webViewConstants.ATTRIBUTE_DISABLEWEBSECURITY] = new BooleanAttribute(webViewConstants.ATTRIBUTE_DISABLEWEBSECURITY, this)
+  @attributes[webViewConstants.ATTRIBUTE_ALLOWPOPUPS] = new BooleanAttribute(webViewConstants.ATTRIBUTE_ALLOWPOPUPS, this)
   @attributes[webViewConstants.ATTRIBUTE_PRELOAD] = new PreloadAttribute(this)
 
   autosizeAttributes = [

atom/renderer/lib/web-view/web-view-constants.coffee

@@ -13,6 +13,7 @@ module.exports =
   ATTRIBUTE_NODEINTEGRATION: 'nodeintegration'
   ATTRIBUTE_PLUGINS: 'plugins'
   ATTRIBUTE_DISABLEWEBSECURITY: 'disablewebsecurity'
+  ATTRIBUTE_ALLOWPOPUPS: 'allowpopups'
   ATTRIBUTE_PRELOAD: 'preload'
   ATTRIBUTE_USERAGENT: 'useragent'