Document the ClientRect* vs DOMRect* situation

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 610 matching lines @@
         WindowMoveResizeMissingArguments = 684,
         SVGSVGElementForceRedraw = 685,
         SVGSVGElementSuspendRedraw = 686,
         SVGSVGElementUnsuspendRedraw = 687,
         SVGSVGElementUnsuspendRedrawAll = 688,
         AudioContextClose = 689,
         ServiceWorkerClientPostMessage = 690,
         CSSZoomNotEqualToOne = 691,
         SVGGraphicsElementGetTransformToElement = 692,
         ServiceWorkerClientsGetAll = 693,
+        ClientRectListItem = 694,
 
         // Add new features immediately above this line. Don't change assigned
         // numbers of any item, and don't reuse removed slots.
         // Also, run update_use_counter_feature_enum.py in chromium/src/tools/metrics/histograms/
         // to update the UMA mapping.
         NumberOfFeatures, // This enum value must be last.
     };
 
     // "count" sets the bit for this feature to 1. Repeated calls are ignored.
     static void count(const Frame*, Feature);
@@ skipping 71 matching lines @@
     bool recordMeasurement(Feature feature) { return m_countBits.recordMeasurement(feature); }
     void updateMeasurements();
 
     CountBits m_countBits;
     BitVector m_CSSFeatureBits;
 };
 
 } // namespace blink
 
 #endif // UseCounter_h