Delay instantiating InputDeviceCapabilities until accessed.

third_party/WebKit/Source/core/events/UIEvent.h

 /*
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 11 matching lines @@
  */
 
 #ifndef UIEvent_h
 #define UIEvent_h
 
 #include "core/CoreExport.h"
 #include "core/events/Event.h"
 #include "core/events/EventDispatchMediator.h"
 #include "core/events/UIEventInit.h"
 #include "core/frame/DOMWindow.h"
+#include "core/input/InputDeviceCapabilities.h"
 
 namespace blink {
 
-class InputDeviceCapabilities;
-
 // FIXME: Get rid of this type alias.
 using AbstractView = DOMWindow;
 
 class CORE_EXPORT UIEvent : public Event {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   static UIEvent* create() { return new UIEvent; }
   static UIEvent* create(const AtomicString& type,
                          const UIEventInit& initializer) {
     return new UIEvent(type, initializer);
   }
   ~UIEvent() override;
 
   void initUIEvent(const AtomicString& type,
                    bool canBubble,
                    bool cancelable,
                    AbstractView*,
                    int detail);
-  void initUIEventInternal(const AtomicString& type,
-                           bool canBubble,
-                           bool cancelable,
-                           EventTarget* relatedTarget,
-                           AbstractView*,
-                           int detail,
-                           InputDeviceCapabilities* sourceCapabilities);
+  void initUIEventInternal(
+      const AtomicString& type,
+      bool canBubble,
+      bool cancelable,
+      EventTarget* relatedTarget,
+      AbstractView*,
+      int detail,
+      const InputDeviceCapabilitiesValue& sourceCapabilities);
 
   AbstractView* view() const { return m_view.get(); }
   int detail() const { return m_detail; }
-  InputDeviceCapabilities* sourceCapabilities() const {
-    return m_sourceCapabilities.get();
-  }
+  InputDeviceCapabilities* sourceCapabilities();
 
   const AtomicString& interfaceName() const override;
   bool isUIEvent() const final;
 
   virtual int which() const;
 
   DECLARE_VIRTUAL_TRACE();
 
  protected:
   UIEvent();
   UIEvent(const AtomicString& type,
           bool canBubble,
           bool cancelable,
           ComposedMode,
           TimeTicks platformTimeStamp,
           AbstractView*,
           int detail,
-          InputDeviceCapabilities* sourceCapabilities);
+          const InputDeviceCapabilitiesValue& sourceCapabilities);
   UIEvent(const AtomicString&, const UIEventInit&);
 
+  const InputDeviceCapabilitiesValue& sourceCapabilitiesValue() const {
+    return m_sourceCapabilities;
+  }
+
  private:
   Member<AbstractView> m_view;
   int m_detail;
-  Member<InputDeviceCapabilities> m_sourceCapabilities;
+  InputDeviceCapabilitiesValue m_sourceCapabilities;
 };
 
 }  // namespace blink
 
 #endif  // UIEvent_h