Incl. custom properties in CSS property UseCounter

third_party/WebKit/Source/core/frame/UseCounter.cpp

 /*
  * Copyright (C) 2012 Google, Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 1221 matching lines @@
 }
 
 void UseCounter::countCrossOriginIframe(const Document& document,
                                         Feature feature) {
   LocalFrame* frame = document.frame();
   if (frame && frame->isCrossOriginSubframe())
     count(frame, feature);
 }
 
 void UseCounter::count(CSSParserMode cssParserMode, CSSPropertyID property) {
-  // FIXME(suzyh): Count custom properties as well as named properties
-  DCHECK(isCSSPropertyIDWithName(property));
+  DCHECK(isCSSPropertyIDWithName(property) || property == CSSPropertyVariable);
 
   if (!isUseCounterEnabledForMode(cssParserMode) || m_muteCount)
     return;
 
   if (!m_CSSRecorded.quickGet(property)) {
     // Note that HTTPArchive tooling looks specifically for this event - see
     // https://github.com/HTTPArchive/httparchive/issues/59
     int sampleId = mapCSSPropertyIdToCSSSampleIdForHistogram(property);
     if (!m_disableReporting) {
       TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("blink.feature_usage"),
@@ skipping 164 matching lines @@
     }
   }
 
   if (needsPagesMeasuredUpdate)
     cssPropertiesHistogram.count(totalPagesMeasuredCSSSampleId());
 
   m_CSSBits.clearAll();
 }
 
 }  // namespace blink