Redirect guest page's ipc message to embedder

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

@@ -66,6 +66,10 @@ createGuest = (embedder, params) ->
       guest.on event, (_, args...) ->
         embedder.send "ATOM_SHELL_GUEST_VIEW_INTERNAL_DISPATCH_EVENT-#{guest.viewInstanceId}", event, args...
 
+  # Dispatch guest's asynchronous IPC messages to embedder.
+  guest.on 'ipc-message', (_, channel, args...) ->
+    embedder.send "ATOM_SHELL_GUEST_VIEW_INTERNAL_IPC_MESSAGE-#{guest.viewInstanceId}", channel, args...
+
   # Autosize.
   guest.on 'size-changed', (_, args...) ->
     embedder.send "ATOM_SHELL_GUEST_VIEW_INTERNAL_SIZE_CHANGED-#{guest.viewInstanceId}", args...

atom/renderer/lib/web-view/guest-view-internal.coffee

@@ -28,6 +28,12 @@ module.exports =
     ipc.on "ATOM_SHELL_GUEST_VIEW_INTERNAL_DISPATCH_EVENT-#{viewInstanceId}", (event, args...) ->
       dispatchEvent webView, event, args...
 
+    ipc.on "ATOM_SHELL_GUEST_VIEW_INTERNAL_IPC_MESSAGE-#{viewInstanceId}", (channel, args...) ->
+      domEvent = new Event('ipc-message')
+      domEvent.channel = channel
+      domEvent.args = [args...]
+      webView.dispatchEvent domEvent
+
     ipc.on "ATOM_SHELL_GUEST_VIEW_INTERNAL_SIZE_CHANGED-#{viewInstanceId}", (args...) ->
       domEvent = new Event('size-changed')
       for f, i in ['oldWidth', 'oldHeight', 'newWidth', 'newHeight']