Use counter for mixing old and new constraints

third_party/WebKit/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 1181 matching lines @@
         UnloadHandler_Navigation = 1379,
         TouchStartUserGestureUtilized = 1380,
         TouchMoveUserGestureUtilized = 1381,
         TouchEndDuringScrollUserGestureUtilized = 1382,
         CSSSelectorPseudoDefined = 1383,
         RTCPeerConnectionAddIceCandidatePromise = 1384,
         RTCPeerConnectionAddIceCandidateLegacy = 1385,
         RTCIceCandidateDefaultSdpMLineIndex = 1386,
         DocumentCreateEventSensorErrorEvent = 1387,
         DocumentCreateEventSensorReadingEvent = 1388,
+        MediaStreamConstraintsOldAndNew = 1389,
 
         // 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 74 matching lines @@
     friend class UseCounterTest;
     static int m_muteCount;
 
     CountBits m_countBits;
     BitVector m_CSSFeatureBits;
 };
 
 } // namespace blink
 
 #endif // UseCounter_h