Make DOMSelection cache Range

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

Index: third_party/WebKit/Source/core/dom/TreeScope.cpp
diff --git a/third_party/WebKit/Source/core/dom/TreeScope.cpp b/third_party/WebKit/Source/core/dom/TreeScope.cpp
index 20c0f87fd42016a62c2ce63a050c633b8c3ad7d7..a1b82d1796088735b78ec988c323009e3e959592 100644
--- a/third_party/WebKit/Source/core/dom/TreeScope.cpp
+++ b/third_party/WebKit/Source/core/dom/TreeScope.cpp
@@ -304,6 +304,10 @@ SVGTreeScopeResources& TreeScope::ensureSVGTreeScopedResources() {
   return *m_svgTreeScopedResources;
 }
 
+bool TreeScope::hasSelection() const {
+  return rootNode().document().frame() && m_selection;
+}
+
 DOMSelection* TreeScope::getSelection() const {
   if (!rootNode().document().frame())
     return nullptr;