CSSParserString::equalIgnoringCase should check string length.

Source/core/css/CSSParserValuesTest.cpp

Index: Source/core/css/CSSParserValuesTest.cpp
diff --git a/Source/core/css/CSSParserValuesTest.cpp b/Source/core/css/CSSParserValuesTest.cpp
index 6d1ac8b939d45b6a14c94d1e517c484285f6d4e3..41ad43ccc2b812e275c378e243af80ca9036cd92 100644
--- a/Source/core/css/CSSParserValuesTest.cpp
+++ b/Source/core/css/CSSParserValuesTest.cpp
@@ -56,4 +56,32 @@ TEST(CSSParserValuesTest, InitWithEmpty16BitsString)
     ASSERT_EQ(0u, cssParserString.length());
 }
 
+TEST(CSSParserValuesTest, EqualIgnoringCase8BitsString)
+{
+    CSSParserString cssParserString;
+    String string8bit("sHaDOw");
+    cssParserString.init(string8bit, 0, string8bit.length());
+
+    ASSERT_TRUE(cssParserString.equalIgnoringCase("shadow"));
+    ASSERT_TRUE(cssParserString.equalIgnoringCase("ShaDow"));
+    ASSERT_FALSE(cssParserString.equalIgnoringCase("shadow-all"));
+    ASSERT_FALSE(cssParserString.equalIgnoringCase("sha"));
+    ASSERT_FALSE(cssParserString.equalIgnoringCase("abCD"));
+}
+
+TEST(CSSParserValuesTest, EqualIgnoringCase16BitsString)
+{
+    String string16bit("sHaDOw");
+    string16bit.ensure16Bit();
+
+    CSSParserString cssParserString;
+    cssParserString.init(string16bit, 0, string16bit.length());
+
+    ASSERT_TRUE(cssParserString.equalIgnoringCase("shadow"));
+    ASSERT_TRUE(cssParserString.equalIgnoringCase("ShaDow"));
+    ASSERT_FALSE(cssParserString.equalIgnoringCase("shadow-all"));
+    ASSERT_FALSE(cssParserString.equalIgnoringCase("sha"));
+    ASSERT_FALSE(cssParserString.equalIgnoringCase("abCD"));
+}
+
 } // namespace