Initialize the new WindowProxy when handing off the global object.

Source/web/tests/WebFrameTest.cpp

 /*
  * Copyright (C) 2010 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 6896 matching lines @@
     v8::Local<v8::Value> localWindowTop = mainFrame()->executeScriptAndReturnValue(WebScriptSource(
         "document.querySelector('#frame2').contentWindow.top;"));
     EXPECT_TRUE(windowTop->StrictEquals(localWindowTop));
 
     // Manually reset to break WebViewHelper's dependency on the stack allocated
     // TestWebFrameClient.
     reset();
     remoteFrame->close();
 }
 
+TEST_F(WebFrameSwapTest, SwapInitializesGlobal)
+{
+    v8::HandleScope scope(v8::Isolate::GetCurrent());
+
+    v8::Local<v8::Value> windowTop = mainFrame()->executeScriptAndReturnValue(WebScriptSource("window"));
+    ASSERT_TRUE(windowTop->IsObject());
+
+    v8::Local<v8::Value> lastChild = mainFrame()->executeScriptAndReturnValue(WebScriptSource("saved = window[2]"));
+    ASSERT_TRUE(lastChild->IsObject());
+
+    FrameTestHelpers::TestWebRemoteFrameClient remoteClient;
+    WebRemoteFrame* remoteFrame = remoteClient.frame();
+    mainFrame()->lastChild()->swap(remoteFrame);
+    remoteFrame->setReplicatedOrigin(SecurityOrigin::createUnique());
+    v8::Local<v8::Value> remoteWindowTop = mainFrame()->executeScriptAndReturnValue(WebScriptSource("saved.top"));
+    EXPECT_TRUE(remoteWindowTop->IsObject());
+    EXPECT_TRUE(windowTop->StrictEquals(remoteWindowTop));
+
+    FrameTestHelpers::TestWebFrameClient client;
+    WebLocalFrame* localFrame = WebLocalFrame::create(&client);
+    localFrame->initializeToReplaceRemoteFrame(remoteFrame, "", WebSandboxFlags::None);
+    remoteFrame->swap(localFrame);
+    v8::Local<v8::Value> localWindowTop = mainFrame()->executeScriptAndReturnValue(WebScriptSource("saved.top"));
+    EXPECT_TRUE(localWindowTop->IsObject());
+    EXPECT_TRUE(windowTop->StrictEquals(localWindowTop));
+
+    reset();
+}
+
 TEST_F(WebFrameSwapTest, RemoteFramesAreIndexable)
 {
     v8::HandleScope scope(v8::Isolate::GetCurrent());
 
     FrameTestHelpers::TestWebRemoteFrameClient remoteClient;
     WebRemoteFrame* remoteFrame = remoteClient.frame();
     mainFrame()->lastChild()->swap(remoteFrame);
     remoteFrame->setReplicatedOrigin(SecurityOrigin::createUnique());
     v8::Local<v8::Value> remoteWindow = mainFrame()->executeScriptAndReturnValue(WebScriptSource("window[2]"));
     EXPECT_TRUE(remoteWindow->IsObject());
@@ skipping 304 matching lines @@
     ASSERT_EQ(2u, popupWebFrameClient.messages.size());
     EXPECT_TRUE(std::string::npos != popupWebFrameClient.messages[1].text.utf8().find("Blocked a frame"));
 
     // Manually reset to break WebViewHelpers' dependencies on the stack
     // allocated WebFrameClients.
     webViewHelper.reset();
     popupWebViewHelper.reset();
 }
 
 } // namespace blink