Add an early abort for the CSSParserFastPaths transform path.

third_party/WebKit/Source/core/css/parser/CSSParserFastPathsTest.cpp

Index: third_party/WebKit/Source/core/css/parser/CSSParserFastPathsTest.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/CSSParserFastPathsTest.cpp b/third_party/WebKit/Source/core/css/parser/CSSParserFastPathsTest.cpp
index e603bd9e2e82b3ad93482446564316c323835c0a..cc302d204de2034a66c041f2a7c5a53d92b720db 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSParserFastPathsTest.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSParserFastPathsTest.cpp
@@ -82,4 +82,12 @@ TEST(CSSParserFastPathsTest, ParseTransformNotFastPath)
     ASSERT_EQ(nullptr, value);
 }
 
+TEST(CSSParserFastPathsTest, ParseInvalidTransform)
+{
+    CSSValue* value = CSSParserFastPaths::maybeParseValue(CSSPropertyTransform, "rotateX(1deg", HTMLStandardMode);
+    ASSERT_EQ(nullptr, value);
+    value = CSSParserFastPaths::maybeParseValue(CSSPropertyTransform, "translateZ(1px) (1px, 1px) rotateX(1deg", HTMLStandardMode);
+    ASSERT_EQ(nullptr, value);
+}
+
 } // namespace blink