Delay instantiating InputDeviceCapabilities until accessed.

third_party/WebKit/Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
@@ skipping 4065 matching lines @@
                                                    m_focusedElement.get());
 
 SetFocusedElementDone:
   updateStyleAndLayoutTree();
   if (LocalFrame* frame = this->frame())
     frame->selection().didChangeFocus();
   return !focusChangeBlocked;
 }
 
 void Document::clearFocusedElement() {
-  setFocusedElement(nullptr, FocusParams(SelectionBehaviorOnFocus::None,
-                                         WebFocusTypeNone, nullptr));
+  setFocusedElement(
+      nullptr, FocusParams(SelectionBehaviorOnFocus::None, WebFocusTypeNone,
+                           InputDeviceCapabilities::Null));
 }
 
 void Document::setSequentialFocusNavigationStartingPoint(Node* node) {
   if (!m_frame)
     return;
   if (!node) {
     m_sequentialFocusNavigationStartingPoint = nullptr;
     return;
   }
   DCHECK_EQ(node->document(), this);
@@ skipping 2482 matching lines @@
 }
 
 void showLiveDocumentInstances() {
   WeakDocumentSet& set = liveDocumentSet();
   fprintf(stderr, "There are %u documents currently alive:\n", set.size());
   for (blink::Document* document : set)
     fprintf(stderr, "- Document %p URL: %s\n", document,
             document->url().getString().utf8().data());
 }
 #endif