Delay instantiating InputDeviceCapabilities until accessed.

third_party/WebKit/Source/core/input/EventHandler.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
@@ skipping 659 matching lines @@
   }
 
   // m_selectionInitiationState is initialized after dispatching mousedown
   // event in order not to keep the selection by DOM APIs because we can't
   // give the user the chance to handle the selection by user action like
   // dragging if we keep the selection in case of mousedown. FireFox also has
   // the same behavior and it's more compatible with other browsers.
   selectionController().initializeSelectionState();
   HitTestResult hitTestResult = EventHandlingUtil::hitTestResultInFrame(
       m_frame, documentPoint, HitTestRequest::ReadOnly);
-  InputDeviceCapabilities* sourceCapabilities =
-      m_frame->document()
-          ->domWindow()
-          ->getInputDeviceCapabilities()
-          ->firesTouchEvents(mouseEvent.fromTouch());
+  InputDeviceCapabilitiesValue sourceCapabilities(mouseEvent.fromTouch());
 
   if (eventResult == WebInputEventResult::NotHandled) {
     eventResult = m_mouseEventManager->handleMouseFocus(hitTestResult,
                                                         sourceCapabilities);
   }
   m_mouseEventManager->setCapturesDragging(
       eventResult == WebInputEventResult::NotHandled || mev.scrollbar());
 
   // If the hit testing originally determined the event was in a scrollbar,
   // refetch the MouseEventWithHitTestResults in case the scrollbar widget was
@@ skipping 1438 matching lines @@
 }
 
 FrameHost* EventHandler::frameHost() const {
   if (!m_frame->page())
     return nullptr;
 
   return &m_frame->page()->frameHost();
 }
 
 }  // namespace blink