Gracefully support Navigator Gamepad methods in a detached state.

Source/modules/device_orientation/DeviceOrientationController.cpp

 /*
  * Copyright 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Samsung Electronics. 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 copyright
@@ skipping 19 matching lines @@
 #include "core/dom/Document.h"
 #include "core/frame/DOMWindow.h"
 #include "core/page/Page.h"
 #include "modules/device_orientation/DeviceOrientationData.h"
 #include "modules/device_orientation/DeviceOrientationDispatcher.h"
 #include "modules/device_orientation/DeviceOrientationEvent.h"
 
 namespace WebCore {
 
 DeviceOrientationController::DeviceOrientationController(Document& document)
-    : DeviceSensorEventController(document)
+    : DeviceSensorEventController(document.page())
     , DOMWindowLifecycleObserver(document.domWindow())
+    , m_document(document)
 {
 }
 
 DeviceOrientationController::~DeviceOrientationController()
 {
     stopUpdating();
 }
 
 void DeviceOrientationController::didChangeDeviceOrientation(DeviceOrientationData* deviceOrientationData)
 {
@@ skipping 41 matching lines @@
 {
     DeviceOrientationDispatcher::instance().removeDeviceOrientationController(this);
 }
 
 bool DeviceOrientationController::isNullEvent(Event* event)
 {
     DeviceOrientationEvent* orientationEvent = toDeviceOrientationEvent(event);
     return !orientationEvent->orientation()->canProvideEventData();
 }
 
+Document* DeviceOrientationController::document()
+{
+    return &m_document;
+}
+
 void DeviceOrientationController::didAddEventListener(DOMWindow* window, const AtomicString& eventType)
 {
     if (eventType != EventTypeNames::deviceorientation)
         return;
 
     if (page() && page()->visibilityState() == PageVisibilityStateVisible)
         startUpdating();
 
     m_hasEventListener = true;
 }
@@ skipping 24 matching lines @@
 {
     if (!m_overrideOrientationData)
         return;
     m_overrideOrientationData.clear();
     DeviceOrientationData* orientation = lastData();
     if (orientation)
         didChangeDeviceOrientation(orientation);
 }
 
 } // namespace WebCore