Make sure to use CSSValueID and CSSPropertyID rather than integers.

Source/core/html/track/TextTrackCue.h

 /*
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  * Copyright (C) 2012, 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 140 matching lines @@
     void markFutureAndPastNodes(ContainerNode*, double, double);
 
     int calculateComputedLinePosition();
 
     virtual const AtomicString& interfaceName() const;
     virtual ScriptExecutionContext* scriptExecutionContext() const;
 
     std::pair<double, double> getCSSPosition() const;
 
     int getCSSSize() const;
-    int getCSSWritingDirection() const;
-    int getCSSWritingMode() const;
+    CSSValueID getCSSWritingDirection() const;
+    CSSValueID getCSSWritingMode() const;
 
     enum WritingDirection {
         Horizontal,
         VerticalGrowingLeft,
         VerticalGrowingRight,
         NumberOfWritingDirections
     };
     WritingDirection getWritingDirection() const { return m_writingDirection; }
 
     enum CueAlignment {
@@ skipping 86 matching lines @@
 
     bool m_isActive;
     bool m_pauseOnExit;
     bool m_snapToLines;
 
     RefPtr<HTMLDivElement> m_cueBackgroundBox;
 
     bool m_displayTreeShouldChange;
     RefPtr<TextTrackCueBox> m_displayTree;
 
-    int m_displayDirection;
+    CSSValueID m_displayDirection;
 
-    int m_displayWritingModeMap[NumberOfWritingDirections];
-    int m_displayWritingMode;
+    CSSValueID m_displayWritingModeMap[NumberOfWritingDirections];
+    CSSValueID m_displayWritingMode;
 
     int m_displaySize;
 
     std::pair<float, float> m_displayPosition;
 #if ENABLE(WEBVTT_REGIONS)
     String m_regionId;
 #endif
 };
 
 } // namespace WebCore
 
 #endif