Make DOMWindowProperty a thin wrapper of ContextLifecycleObserver

third_party/WebKit/Source/modules/screen_orientation/ScreenOrientationControllerImpl.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 "modules/screen_orientation/ScreenOrientationControllerImpl.h"
 
 #include "core/events/Event.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
@@ skipping 139 matching lines @@
   for (size_t i = 0; i < childFrames.size(); ++i) {
     if (ScreenOrientationControllerImpl* controller =
             ScreenOrientationControllerImpl::from(*childFrames[i]))
       controller->notifyOrientationChanged();
   }
 }
 
 void ScreenOrientationControllerImpl::setOrientation(
     ScreenOrientation* orientation) {
   m_orientation = orientation;
-  if (m_orientation)
+  if (isActiveAndVisible())
     updateOrientation();
   notifyDispatcher();
 }
 
 void ScreenOrientationControllerImpl::lock(
     WebScreenOrientationLockType orientation,
     std::unique_ptr<WebLockOrientationCallback> callback) {
   // When detached, the client is no longer valid.
   if (!m_client)
     return;
@@ skipping 30 matching lines @@
 }
 
 void ScreenOrientationControllerImpl::unregisterWithDispatcher() {
   ScreenOrientationDispatcher::instance().removeController(this);
 }
 
 bool ScreenOrientationControllerImpl::hasLastData() {
   return true;
 }
 
-void ScreenOrientationControllerImpl::frameDestroyed() {
+void ScreenOrientationControllerImpl::contextDestroyed() {
   m_client = nullptr;
-  DOMWindowProperty::frameDestroyed();
+  DOMWindowProperty::contextDestroyed();
   m_activeLock = false;
 }
 
 void ScreenOrientationControllerImpl::notifyDispatcher() {
   if (m_orientation && page()->isPageVisible())
     startUpdating();
   else
     stopUpdating();
 }
 
 DEFINE_TRACE(ScreenOrientationControllerImpl) {
   visitor->trace(m_orientation);
   DOMWindowProperty::trace(visitor);
   Supplement<LocalFrame>::trace(visitor);
   PlatformEventController::trace(visitor);
 }
 
 }  // namespace blink