Updated hover media feature to comply updated media queries spec

Source/core/css/MediaQueryExp.cpp

 /*
  * CSS Media Query
  *
  * Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 2013 Apple 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:
@@ skipping 17 matching lines @@
  */
 
 #include "config.h"
 #include "core/css/MediaQueryExp.h"
 
 #include "core/css/CSSAspectRatioValue.h"
 #include "core/css/CSSParserValues.h"
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/html/parser/HTMLParserIdioms.h"
 #include "platform/Decimal.h"
+#include "platform/RuntimeEnabledFeatures.h"
 #include "wtf/text/StringBuffer.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace blink {
 
 using namespace MediaFeatureNames;
 
 static inline bool featureWithCSSValueID(const String& mediaFeature, const CSSParserValue* value)
 {
     if (!value->id)
         return false;
 
     return mediaFeature == orientationMediaFeature
         || mediaFeature == pointerMediaFeature
+        || (mediaFeature == hoverMediaFeature && RuntimeEnabledFeatures::hoverMediaQueryKeywordsEnabled())
         || mediaFeature == scanMediaFeature;
 }
 
 static inline bool featureWithValidIdent(const String& mediaFeature, CSSValueID ident)
 {
     if (mediaFeature == orientationMediaFeature)
         return ident == CSSValuePortrait || ident == CSSValueLandscape;
 
     if (mediaFeature == pointerMediaFeature)
         return ident == CSSValueNone || ident == CSSValueCoarse || ident == CSSValueFine;
 
+    if (mediaFeature == hoverMediaFeature && RuntimeEnabledFeatures::hoverMediaQueryKeywordsEnabled())
+        return ident == CSSValueNone || ident == CSSValueOnDemand || ident == CSSValueHover;
+
     if (mediaFeature == scanMediaFeature)
         return ident == CSSValueInterlace || ident == CSSValueProgressive;
 
     ASSERT_NOT_REACHED();
     return false;
 }
 
 static bool positiveLengthUnit(const int unit)
 {
     switch (unit) {
@@ skipping 68 matching lines @@
         || mediaFeature == maxDevicePixelRatioMediaFeature
         || mediaFeature == minDevicePixelRatioMediaFeature;
 }
 
 static inline bool featureWithZeroOrOne(const String& mediaFeature, const CSSParserValue* value)
 {
     if (!value->isInt || !(value->fValue == 1 || !value->fValue))
         return false;
 
     return mediaFeature == gridMediaFeature
-        || mediaFeature == hoverMediaFeature;
+        || (mediaFeature == hoverMediaFeature && !RuntimeEnabledFeatures::hoverMediaQueryKeywordsEnabled());
 }
 
 static inline bool featureWithAspectRatio(const String& mediaFeature)
 {
     return mediaFeature == aspectRatioMediaFeature
         || mediaFeature == deviceAspectRatioMediaFeature
         || mediaFeature == minAspectRatioMediaFeature
         || mediaFeature == maxAspectRatioMediaFeature
         || mediaFeature == minDeviceAspectRatioMediaFeature
         || mediaFeature == maxDeviceAspectRatioMediaFeature;
@@ skipping 170 matching lines @@
         output.append("/");
         output.append(printNumber(denominator));
     } else if (isID) {
         output.append(getValueName(id));
     }
 
     return output.toString();
 }
 
 } // namespace