Make Range::createAdjustedToTreeScope() to handle the shadow root at end of document tree correctly.

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/dom/Range.h"
 
 #include "bindings/core/v8/ExceptionStatePlaceholder.h"
 #include "core/dom/Element.h"
 #include "core/dom/NodeList.h"
 #include "core/dom/Text.h"
@@ skipping 23 matching lines @@
   m_document = HTMLDocument::create();
   HTMLHtmlElement* html = HTMLHtmlElement::create(*m_document);
   html->appendChild(HTMLBodyElement::create(*m_document));
   m_document->appendChild(html);
 }
 
 HTMLDocument& RangeTest::document() const {
   return *m_document;
 }
 
+TEST_F(RangeTest, createAdjustedToTreeScopeWithPositionInShadowTree) {
+  document().body()->setInnerHTML("<div><select><option>012</option></div>");
+  Element* const selectElement = document().querySelector("select");
+  const Position& position =
+      Position::afterNode(selectElement->userAgentShadowRoot());
+  Range* const range = Range::createAdjustedToTreeScope(document(), position);
+  EXPECT_EQ(range->startContainer(), selectElement->parentNode());
+  EXPECT_EQ(static_cast<unsigned>(range->startOffset()),
+            selectElement->nodeIndex());
+  EXPECT_TRUE(range->collapsed());
+}
+
 TEST_F(RangeTest, SplitTextNodeRangeWithinText) {
   document().body()->setInnerHTML("1234", ASSERT_NO_EXCEPTION);
   Text* oldText = toText(document().body()->firstChild());
 
   Range* range04 = Range::create(document(), oldText, 0, oldText, 4);
   Range* range02 = Range::create(document(), oldText, 0, oldText, 2);
   Range* range22 = Range::create(document(), oldText, 2, oldText, 2);
   Range* range24 = Range::create(document(), oldText, 2, oldText, 4);
 
   oldText->splitText(2, ASSERT_NO_EXCEPTION);
@@ skipping 147 matching lines @@
   text->deleteData(0, 3, ASSERT_NO_EXCEPTION);
 
   EXPECT_TRUE(range->boundaryPointsValid());
   EXPECT_EQ(span2, range->startContainer());
   EXPECT_EQ(0, range->startOffset());
   EXPECT_EQ(div, range->endContainer());
   EXPECT_EQ(2, range->endOffset());
 }
 
 }  // namespace blink