maximumCSSSampleId  575 Source/core/frame/UseCounter.cpp             blink::Platform::current()->histogramEnumeration("WebCore.FeatureObserver.CSSProperties", cssSampleId, maximumCSSSampleId());
maximumCSSSampleId  581 Source/core/frame/UseCounter.cpp         blink::Platform::current()->histogramEnumeration("WebCore.FeatureObserver.CSSProperties", totalPagesMeasuredCSSSampleId(), maximumCSSSampleId());