v8binding: Makes ToV8(window) work without a frame.

third_party/WebKit/Source/core/frame/DOMWindow.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/frame/DOMWindow.h"
 
 #include <memory>
+
+#include "bindings/core/v8/WindowProxyManager.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/dom/SecurityContext.h"
 #include "core/events/MessageEvent.h"
 #include "core/frame/Frame.h"
 #include "core/frame/FrameClient.h"
 #include "core/frame/FrameConsole.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "core/frame/Location.h"
 #include "core/frame/Settings.h"
 #include "core/frame/UseCounter.h"
 #include "core/input/InputDeviceCapabilities.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/loader/MixedContentChecker.h"
 #include "core/page/ChromeClient.h"
 #include "core/page/FocusController.h"
 #include "core/page/Page.h"
 #include "core/probe/CoreProbes.h"
 #include "platform/weborigin/KURL.h"
 #include "platform/weborigin/SecurityOrigin.h"
 #include "platform/weborigin/Suborigin.h"
 
 namespace blink {
 
-DOMWindow::DOMWindow(Frame& frame) : frame_(frame), window_is_closing_(false) {}
+DOMWindow::DOMWindow(Frame& frame)
+    : frame_(frame),
+      window_proxy_manager_(frame.GetWindowProxyManager()),
+      window_is_closing_(false) {}
 
 DOMWindow::~DOMWindow() {
   // The frame must be disconnected before finalization.
   DCHECK(!frame_);
 }
 
 v8::Local<v8::Object> DOMWindow::Wrap(v8::Isolate*,
                                       v8::Local<v8::Object> creation_context) {
   LOG(FATAL) << "DOMWindow must never be wrapped with wrap method.  The "
                 "wrappers must be created at WindowProxy::createContext() and "
@@ skipping 370 matching lines @@
   }
 
   // If we're a top level window, bring the window to the front.
   if (GetFrame()->IsMainFrame() && allow_focus)
     page->GetChromeClient().Focus();
 
   page->GetFocusController().FocusDocumentView(GetFrame(),
                                                true /* notifyEmbedder */);
 }
 
+v8::Local<v8::Object> DOMWindow::GlobalProxy(DOMWrapperWorld& world) {
+  return window_proxy_manager_->GetWindowProxy(world)
+      ->GlobalProxyIfNotDetached();

[haraken, 2017/04/14 18:51:50]

Shall we add a TODO and mention that this should return a valid global proxy
even after the frame gets detached?

[Yuki, 2017/04/17 07:15:26]

Done.

+}
+
 InputDeviceCapabilitiesConstants* DOMWindow::GetInputDeviceCapabilities() {
   if (!input_capabilities_)
     input_capabilities_ = new InputDeviceCapabilitiesConstants;
   return input_capabilities_;
 }
 
 DEFINE_TRACE(DOMWindow) {
   visitor->Trace(frame_);
+  visitor->Trace(window_proxy_manager_);
   visitor->Trace(input_capabilities_);
   visitor->Trace(location_);
   EventTargetWithInlineData::Trace(visitor);
 }
 
 }  // namespace blink