Transitively keep track of an isolated world's children scripts and worlds.

third_party/WebKit/Source/web/WebLocalFrameImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1804 matching lines @@
 
     FrameLoadRequest newRequest = request;
     FrameLoadType loadType = FrameLoadTypeStandard;
     if (childItem) {
         newRequest = FrameLoadRequest(request.originDocument(),
             FrameLoader::resourceRequestFromHistoryItem(childItem.get(), UseProtocolCachePolicy));
         loadType = FrameLoadTypeInitialHistoryLoad;
     }
     webframeChild->frame()->loader().load(newRequest, loadType, childItem.get());
 
+    // Apply the creating worldId to the created child frame.
+    if (v8::Isolate::GetCurrent()->InContext()) {
+        RefPtr<DOMWrapperWorld> parentFrameOriginWorld = PassRefPtr<DOMWrapperWorld>(DOMWrapperWorld::current(v8::Isolate::GetCurrent()).originWorld());
+        ScriptState::forMainWorld(webframeChild->frame())->world().setOriginWorld(parentFrameOriginWorld);
+    }
+
     // Note a synchronous navigation (about:blank) would have already processed
     // onload, so it is possible for the child frame to have already been
     // detached by script in the page.
     if (!webframeChild->parent())
         return nullptr;
     return webframeChild->frame();
 }
 
 void WebLocalFrameImpl::didChangeContentsSize(const IntSize& size)
 {
@@ skipping 426 matching lines @@
 }
 
 WebSandboxFlags WebLocalFrameImpl::effectiveSandboxFlags() const
 {
     if (!frame())
         return WebSandboxFlags::None;
     return static_cast<WebSandboxFlags>(frame()->loader().effectiveSandboxFlags());
 }
 
 } // namespace blink