Send port-closed notification when a frame with ports unloads....

chrome/renderer/extensions/event_bindings.h

Index: chrome/renderer/extensions/event_bindings.h
===================================================================
--- chrome/renderer/extensions/event_bindings.h	(revision 18701)
+++ chrome/renderer/extensions/event_bindings.h	(working copy)
@@ -10,6 +10,7 @@
 #include <string>
 
 class RenderThreadBase;
+class WebFrame;
 
 // This class deals with the javascript bindings related to Event objects.
 class EventBindings {
@@ -19,7 +20,14 @@
 
   // Allow RenderThread to be mocked out.
   static void SetRenderThread(RenderThreadBase* thread);
+  static RenderThreadBase* GetRenderThread();
 
+  // Notify script that the document object is ready.  We don't use the DOM
+  // unload event because that causes Chrome's "sudden termination" to be
+  // disabled for this renderer, meaning we'll slow down shutdown.
+  static void HandleDocumentReady(WebFrame* frame);
+  static void HandleDocumentClose(WebFrame* frame);
+
   // Calls the given function in each registered context which is listening
   // for events.  The function can be an object property, ie:
   // "chromium.Event.dispatch_".