Implement 'scroll-behavior' parsing

Source/core/css/CSSPrimitiveValueMappings.h

 /*
  * Copyright (C) 2007 Alexey Proskuryakov <ap@nypop.com>.
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2009 Jeff Schiller <codedread@gmail.com>
  * Copyright (C) Research In Motion Limited 2010. 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 27 matching lines @@
 #include "core/rendering/style/LineClampValue.h"
 #include "core/rendering/style/RenderStyleConstants.h"
 #include "core/rendering/style/SVGRenderStyleDefs.h"
 #include "platform/Length.h"
 #include "platform/ThemeTypes.h"
 #include "platform/fonts/FontDescription.h"
 #include "platform/fonts/FontSmoothingMode.h"
 #include "platform/fonts/TextRenderingMode.h"
 #include "platform/graphics/GraphicsTypes.h"
 #include "platform/graphics/Path.h"
+#include "platform/scroll/ScrollableArea.h"
 #include "platform/text/TextDirection.h"
 #include "platform/text/UnicodeBidi.h"
 #include "platform/text/WritingMode.h"
 #include "wtf/MathExtras.h"
 
 namespace WebCore {
 
 template<> inline CSSPrimitiveValue::CSSPrimitiveValue(short i)
     : CSSValue(PrimitiveClass)
 {
@@ skipping 4979 matching lines @@
         return OverflowAlignmentTrue;
     case CSSValueSafe:
         return OverflowAlignmentSafe;
     default:
         break;
     }
     ASSERT_NOT_REACHED();
     return OverflowAlignmentTrue;
 }
 
+template<> inline CSSPrimitiveValue::CSSPrimitiveValue(ScrollBehavior behavior)
+    : CSSValue(PrimitiveClass)
+{
+    m_primitiveUnitType = CSS_VALUE_ID;
+    switch (behavior) {
+    case ScrollBehaviorInstant:
+        m_value.valueID = CSSValueInstant;
+        break;
+    case ScrollBehaviorSmooth:
+        m_value.valueID = CSSValueSmooth;
+        break;
+    case ScrollBehaviorAuto:
+        // Behavior 'auto' is only allowed in ScrollOptions arguments passed to
+        // CSSOM scroll APIs.
+        ASSERT_NOT_REACHED();
+    }
+}
+
+template<> inline CSSPrimitiveValue::operator ScrollBehavior() const
+{
+    switch (getValueID()) {
+    case CSSValueInstant:
+        return ScrollBehaviorInstant;
+    case CSSValueSmooth:
+        return ScrollBehaviorSmooth;
+    default:
+        break;
+    }
+    ASSERT_NOT_REACHED();
+    return ScrollBehaviorInstant;
+}
+
 }
 
 #endif