Add use counters for VTTCue use/rendering and its attributes

Source/core/frame/UseCounter.h

 /*
  * Copyright (C) 2012 Google, 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 398 matching lines @@
         HTMLPreElementWrap = 399,
         SelectionBaseNode = 400,
         SelectionBaseOffset = 401,
         SelectionExtentNode = 402,
         SelectionExtentOffset = 403,
         SelectionType = 404,
         SelectionModify = 405,
         SelectionSetBaseAndExtent = 406,
         SelectionEmpty = 407,
         SVGFEMorphologyElementSetRadius = 408,
+        VTTCue = 409,
+        VTTCueRender = 410,
+        VTTCueRenderVertical = 411,
+        VTTCueRenderSnapToLinesFalse = 412,
+        VTTCueRenderLineNotAuto = 413,
+        VTTCueRenderPositionNot50 = 414,
+        VTTCueRenderSizeNot100 = 415,
+        VTTCueRenderAlignNotMiddle = 416,
         // Add new features immediately above this line. Don't change assigned
         // numbers of any item, and don't reuse removed slots.
         NumberOfFeatures, // This enum value must be last.
     };
 
     // "count" sets the bit for this feature to 1. Repeated calls are ignored.
     static void count(const Document&, Feature);
     static void count(const ExecutionContext*, Feature);
     void count(CSSParserContext, CSSPropertyID);
     void count(Feature);
@@ skipping 42 matching lines @@
 
     void updateMeasurements();
 
     OwnPtr<BitVector> m_countBits;
     BitVector m_CSSFeatureBits;
 };
 
 } // namespace WebCore
 
 #endif // UseCounter_h