Added ASSERT_SIZE checks to CSSValueList and CSSPrimitiveValue

third_party/WebKit/Source/core/css/CSSPrimitiveValue.cpp

Index: third_party/WebKit/Source/core/css/CSSPrimitiveValue.cpp
diff --git a/third_party/WebKit/Source/core/css/CSSPrimitiveValue.cpp b/third_party/WebKit/Source/core/css/CSSPrimitiveValue.cpp
index 5c2dcb865baf8ea3c9a4516375d6301fc305d6eb..eb5a04daf6ae195bc5252f350737f95a68b2d6d7 100644
--- a/third_party/WebKit/Source/core/css/CSSPrimitiveValue.cpp
+++ b/third_party/WebKit/Source/core/css/CSSPrimitiveValue.cpp
@@ -26,6 +26,7 @@
 #include "core/css/CSSToLengthConversionData.h"
 #include "core/css/CSSValuePool.h"
 #include "platform/LayoutUnit.h"
+#include "wtf/SizeAssertions.h"
 #include "wtf/StdLibExtras.h"
 
 using namespace WTF;
@@ -41,6 +42,11 @@ const int minValueForCssLength = INT_MIN / kFixedPointDenominator + 2;
 
 } // namespace
 
+struct SameSizeAsCSSPrimitiveValue : CSSValue {
+    double num;
+};
+ASSERT_SIZE(CSSPrimitiveValue, SameSizeAsCSSPrimitiveValue);
+
 float CSSPrimitiveValue::clampToCSSLengthRange(double value)
 {
     return clampTo<float>(value, minValueForCssLength, maxValueForCssLength);