Partial implementation of inline StylePropertyMap.

third_party/WebKit/Source/core/css/cssom/LengthValue.h

Index: third_party/WebKit/Source/core/css/cssom/LengthValue.h
diff --git a/third_party/WebKit/Source/core/css/cssom/LengthValue.h b/third_party/WebKit/Source/core/css/cssom/LengthValue.h
index dbf2763a894796ae2f9296de4cc905255e9c7a13..333024a0e14a52bebcaa28df2f315d21a4a97c02 100644
--- a/third_party/WebKit/Source/core/css/cssom/LengthValue.h
+++ b/third_party/WebKit/Source/core/css/cssom/LengthValue.h
@@ -30,6 +30,8 @@ public:
     static LengthValue* fromDictionary(const CalcDictionary&, ExceptionState&);
 
 protected:
+    static const int kNumSupportedUnits = 15;
+
     LengthValue() {}
 
     virtual LengthValue* addInternal(const LengthValue* other, ExceptionState&);
@@ -43,10 +45,17 @@ protected:
             && unit != CSSPrimitiveValue::UnitType::QuirkyEms
             && unit != CSSPrimitiveValue::UnitType::UserUnits;
     }
-
-    static const int kNumSupportedUnits = 15;
 };
 
+#define DEFINE_LENGTH_TYPE_CASTS(argumentType) \
+    DEFINE_TYPE_CASTS(LengthValue, argumentType, value, \
+        (value->type() == StyleValue::StyleValueType::SimpleLengthType \
+        || value->type() == StyleValue::StyleValueType::CalcLengthType), \
+        (value.type() == StyleValue::StyleValueType::SimpleLengthType \
+        || value.type() == StyleValue::StyleValueType::CalcLengthType))
+
+DEFINE_LENGTH_TYPE_CASTS(StyleValue);
+
 } // namespace blink
 
 #endif