Code health: Add type checks to CSSLengthInterpolationType::nonInterpolableValuesAreCompatible()

third_party/WebKit/Source/core/animation/NonInterpolableValue.h

 // Copyright 2015 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.
 
 #ifndef NonInterpolableValue_h
 #define NonInterpolableValue_h
 
 #include "wtf/RefCounted.h"
 
 namespace blink {
@@ skipping 10 matching lines @@
 // These macros provide safe downcasts of NonInterpolableValue subclasses with debug assertions.
 // See CSSValueInterpolationType.cpp for example usage.
 #define DECLARE_NON_INTERPOLABLE_VALUE_TYPE() \
     static Type staticType;                   \
     Type getType() const final { return staticType; }
 
 #define DEFINE_NON_INTERPOLABLE_VALUE_TYPE(T) \
     NonInterpolableValue::Type T::staticType = &T::staticType;
 
 #define DEFINE_NON_INTERPOLABLE_VALUE_TYPE_CASTS(T) \
-    DEFINE_TYPE_CASTS(T, NonInterpolableValue, value, value->getType() == T::staticType, value.getType() == T::staticType);
+    inline bool is##T(const NonInterpolableValue* value) { return !value || value->getType() == T::staticType; } \
+    DEFINE_TYPE_CASTS(T, NonInterpolableValue, value, is##T(value), is##T(&value));
+
 
 } // namespace blink
 
 #endif // NonInterpolableValue_h