Fix selectionEnd value in a case of dragging out from an INPUT element.

third_party/WebKit/Source/core/html/HTMLTextFormControlElementTest.cpp

Index: third_party/WebKit/Source/core/html/HTMLTextFormControlElementTest.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLTextFormControlElementTest.cpp b/third_party/WebKit/Source/core/html/HTMLTextFormControlElementTest.cpp
index 2ec394fd99798ba5c061762516569f651c4ba49d..48f07fa55773df93870a561f04d6a8a3cd3fabdf 100644
--- a/third_party/WebKit/Source/core/html/HTMLTextFormControlElementTest.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLTextFormControlElementTest.cpp
@@ -215,4 +215,12 @@ TEST_F(HTMLTextFormControlElementTest, SpellCheckDoesNotCauseUpdateLayout)
     EXPECT_EQ(startCount, layoutCount());
 }
 
+TEST_F(HTMLTextFormControlElementTest, IndexForPosition)
+{
+    HTMLInputElement* input = toHTMLInputElement(document().getElementById("input"));
+    input->setValue("Hello");
+    HTMLElement* innerEditor = input->innerEditorElement();
+    EXPECT_EQ(5, HTMLTextFormControlElement::indexForPosition(innerEditor, Position(innerEditor, PositionAnchorType::AfterAnchor)));
+}
+
 } // namespace blink