Create DOMWindowStorage as a DOMWindowLifecycleObserver

Source/core/storage/DOMWindowStorageController.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 "config.h"
+#include "core/storage/DOMWindowStorageController.h"
+
+#include "core/dom/Document.h"
+#include "core/events/Event.h"
+#include "core/frame/LocalDOMWindow.h"
+#include "core/page/Page.h"
+
+namespace blink {
+
+DOMWindowStorageController::DOMWindowStorageController(Document& document)
+    : DOMWindowLifecycleObserver(document.domWindow())
+    , m_document(document)
+{
+}
+
+DOMWindowStorageController::~DOMWindowStorageController()
+{
+}
+
+// static
+const char* DOMWindowStorageController::supplementName()
+{
+    return "DOMWindowStorageController";
+}
+
+// static
+DOMWindowStorageController& DOMWindowStorageController::from(Document& document)
+{
+    DOMWindowStorageController* controller = static_cast<DOMWindowStorageController*>(WillBeHeapSupplement<Document>::from(document, supplementName()));
+    if (!controller) {
+        controller = new DOMWindowStorageController(document);
+        DocumentSupplement::provideTo(document, supplementName(), adoptPtrWillBeNoop(controller));
+    }
+    return *controller;
+}
+
+void DOMWindowStorageController::didAddEventListener(LocalDOMWindow* window, const AtomicString& eventType)
+{
+    if (eventType == EventTypeNames::storage) {
+        // Creating these blink::Storage objects informs the system that we'd like to receive
+        // notifications about storage events that might be triggered in other processes. Rather
+        // than subscribe to these notifications explicitly, we subscribe to them implicitly to
+        // simplify the work done by the system.
+        window->localStorage(IGNORE_EXCEPTION);
+        window->sessionStorage(IGNORE_EXCEPTION);
+    }
+}
+
+} // namespace blink