Delay instantiating InputDeviceCapabilities until accessed.

third_party/WebKit/Source/core/events/MouseEvent.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 200 matching lines @@
              const String& region);
 
   MouseEvent(const AtomicString& type, const MouseEventInit&);
 
   MouseEvent();
 
   short rawButton() const { return m_button; }
 
  private:
   friend class MouseEventDispatchMediator;
-  void initMouseEventInternal(const AtomicString& type,
-                              bool canBubble,
-                              bool cancelable,
-                              AbstractView*,
-                              int detail,
-                              int screenX,
-                              int screenY,
-                              int clientX,
-                              int clientY,
-                              PlatformEvent::Modifiers,
-                              short button,
-                              EventTarget* relatedTarget,
-                              InputDeviceCapabilities* sourceCapabilities,
-                              unsigned short buttons = 0);
+  void initMouseEventInternal(
+      const AtomicString& type,
+      bool canBubble,
+      bool cancelable,
+      AbstractView*,
+      int detail,
+      int screenX,
+      int screenY,
+      int clientX,
+      int clientY,
+      PlatformEvent::Modifiers,
+      short button,
+      EventTarget* relatedTarget,
+      const InputDeviceCapabilitiesValue& sourceCapabilities,
+      unsigned short buttons = 0);
 
   void initCoordinates(const double clientX, const double clientY);
   void initCoordinatesFromRootFrame(int windowX, int windowY);
   void receivedTarget() final;
 
   void computePageLocation();
   void computeRelativePosition();
 
   DoublePoint m_screenLocation;
   DoublePoint m_clientLocation;
@@ skipping 22 matching lines @@
   MouseEvent& event() const;
 
   DispatchEventResult dispatchEvent(EventDispatcher&) const override;
 };
 
 DEFINE_EVENT_TYPE_CASTS(MouseEvent);
 
 }  // namespace blink
 
 #endif  // MouseEvent_h