Make DOMSelection cache Range

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

 /*
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  *
  * 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
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 286 matching lines @@
 
   return elementsFromHitTestResult(result);
 }
 
 SVGTreeScopeResources& TreeScope::ensureSVGTreeScopedResources() {
   if (!m_svgTreeScopedResources)
     m_svgTreeScopedResources = new SVGTreeScopeResources(this);
   return *m_svgTreeScopedResources;
 }
 
+bool TreeScope::hasSelection() const {
+  return rootNode().document().frame() && m_selection;
+}
+
 DOMSelection* TreeScope::getSelection() const {
   if (!rootNode().document().frame())
     return nullptr;
 
   if (m_selection)
     return m_selection.get();
 
   // FIXME: The correct selection in Shadow DOM requires that Position can have
   // a ShadowRoot as a container.  See
   // https://bugs.webkit.org/show_bug.cgi?id=82697
@@ skipping 212 matching lines @@
   visitor->trace(m_idTargetObserverRegistry);
   visitor->trace(m_selection);
   visitor->trace(m_elementsById);
   visitor->trace(m_imageMapsByName);
   visitor->trace(m_scopedStyleResolver);
   visitor->trace(m_radioButtonGroupScope);
   visitor->trace(m_svgTreeScopedResources);
 }
 
 }  // namespace blink