Add a UseCounter for legacy fullscreen key event filtering

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 455 matching lines @@
         CSSSelectorPseudoUnresolved = 466,
         CSSSelectorPseudoShadow = 467,
         CSSSelectorPseudoContent = 468,
         CSSSelectorPseudoHost = 469,
         CSSSelectorPseudoHostContext = 470,
         CSSDeepCombinator = 471,
         SyncXHRWithCredentials = 472,
         // The above items are available in M37 branch.
 
         UseAsm = 473,
+        KeyEventNotAllowedInFullScreen = 474,
         // 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 Document&, Feature);
     // This doesn't count for ExecutionContexts for shared workers and service
@@ skipping 50 matching lines @@
 
     void updateMeasurements();
 
     OwnPtr<BitVector> m_countBits;
     BitVector m_CSSFeatureBits;
 };
 
 } // namespace WebCore
 
 #endif // UseCounter_h