Make sure to use CSSValueID and CSSPropertyID rather than integers.

Source/core/html/track/TextTrackCue.cpp

 /*
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  * Copyright (C) 2011, 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 1100 matching lines @@
     // writing direction is not horizontal, but cue's region identifier is not
     // the empty string, let cue's region identifier be the empty string.
     if (m_regionId.isEmpty())
         return;
 
     if (m_linePosition != undefinedPosition || m_cueSize != 100 || m_writingDirection != Horizontal)
         m_regionId = emptyString();
 #endif
 }
 
-int TextTrackCue::getCSSWritingDirection() const
+CSSValueID TextTrackCue::getCSSWritingDirection() const
 {
     return m_displayDirection;
 }
 
-int TextTrackCue::getCSSWritingMode() const
+CSSValueID TextTrackCue::getCSSWritingMode() const
 {
     return m_displayWritingMode;
 }
 
 int TextTrackCue::getCSSSize() const
 {
     return m_displaySize;
 }
 
 std::pair<double, double> TextTrackCue::getCSSPosition() const
@@ skipping 46 matching lines @@
     if (m_cueSize != cue.size())
         return false;
     if (align() != cue.align())
         return false;
     
     return true;
 }
 
 } // namespace WebCore