Add support for 'display-mode' MQ defined in Manifest 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 29 matching lines @@
 
 namespace blink {
 
 using namespace MediaFeatureNames;
 
 static inline bool featureWithCSSValueID(const String& mediaFeature, const CSSParserValue* value)
 {
     if (!value->id)
         return false;
 
-    return mediaFeature == orientationMediaFeature
+    return mediaFeature == displayModeMediaFeature
+        || mediaFeature == orientationMediaFeature
         || mediaFeature == pointerMediaFeature
         || mediaFeature == anyPointerMediaFeature
         || mediaFeature == hoverMediaFeature
         || mediaFeature == anyHoverMediaFeature
         || mediaFeature == scanMediaFeature;
 }
 
 static inline bool featureWithValidIdent(const String& mediaFeature, CSSValueID ident)
 {
+    if (mediaFeature == displayModeMediaFeature)
+        return ident == CSSValueFullscreen || ident == CSSValueStandalone || ident == CSSValueMinimalUi || ident == CSSValueBrowser;
+
     if (mediaFeature == orientationMediaFeature)
         return ident == CSSValuePortrait || ident == CSSValueLandscape;
 
     if (mediaFeature == pointerMediaFeature || mediaFeature == anyPointerMediaFeature)
         return ident == CSSValueNone || ident == CSSValueCoarse || ident == CSSValueFine;
 
     if (mediaFeature == hoverMediaFeature || mediaFeature == anyHoverMediaFeature)
         return ident == CSSValueNone || ident == CSSValueOnDemand || ident == CSSValueHover;
 
     if (mediaFeature == scanMediaFeature)
@@ skipping 267 matching lines @@
         output.append('/');
         output.append(printNumber(denominator));
     } else if (isID) {
         output.append(getValueName(id));
     }
 
     return output.toString();
 }
 
 } // namespace