Measure usage of createObjectURL and srcObject

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 1305 matching lines @@
         TextInputEventOnNotNode = 1592,
         WebkitBeforeTextInsertedOnInput = 1593,
         WebkitBeforeTextInsertedOnTextArea = 1594,
         WebkitBeforeTextInsertedOnContentEditable = 1595,
         WebkitBeforeTextInsertedOnNotNode = 1596,
         WebkitEditableContentChangedOnInput = 1597,
         WebkitEditableContentChangedOnTextArea = 1598,
         WebkitEditableContentChangedOnContentEditable = 1599,
         WebkitEditableContentChangedOnNotNode = 1600,
         V8NavigatorUserMediaError_ConstraintName_AttributeGetter = 1601,
+        V8HTMLMediaElement_SrcObject_AttributeGetter = 1602,
+        V8HTMLMediaElement_SrcObject_AttributeSetter = 1603,
+        CreateObjectURLBlob = 1604,
+        CreateObjectURLMediaSource = 1605,
+        CreateObjectURLMediaStream = 1606,
 
         // 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 62 matching lines @@
     private:
         // Tracks what features/properties need to be reported to the legacy histograms.
         BitVector m_featureBits;
         BitVector m_CSSBits;
     } m_legacyCounter;
 };
 
 } // namespace blink
 
 #endif // UseCounter_h