Editing: isVisuallyEquivalentCandidate() should return false for Position with Document.

third_party/WebKit/Source/core/editing/VisibleUnitsTest.cpp

Index: third_party/WebKit/Source/core/editing/VisibleUnitsTest.cpp
diff --git a/third_party/WebKit/Source/core/editing/VisibleUnitsTest.cpp b/third_party/WebKit/Source/core/editing/VisibleUnitsTest.cpp
index 6f3dc36f95a96b59f7932dc5f84632cb476f2dfe..6a6930ee963178f377d90c93dadca2bb3cc0c24c 100644
--- a/third_party/WebKit/Source/core/editing/VisibleUnitsTest.cpp
+++ b/third_party/WebKit/Source/core/editing/VisibleUnitsTest.cpp
@@ -690,6 +690,13 @@ TEST_F(VisibleUnitsTest, isVisuallyEquivalentCandidateWithHTMLHtmlElement)
     EXPECT_FALSE(isVisuallyEquivalentCandidate(Position(two.get(), 1)));
 }
 
+TEST_F(VisibleUnitsTest, isVisuallyEquivalentCandidateWithDocument)
+{
+    updateLayoutAndStyleForPainting();
+
+    EXPECT_FALSE(isVisuallyEquivalentCandidate(Position(&document(), 0)));
+}
+
 TEST_F(VisibleUnitsTest, leftPositionOf)
 {
     const char* bodyContent = "<b id=zero>0</b><p id=host><b id=one>1</b><b id=two>22</b></p><b id=three>333</b>";