[IndexedDB] Added Observer UseCounter

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 1458 matching lines @@
     PresentationReceiverSecureOrigin = 1820,
     PresentationRequestInsecureOrigin = 1821,
     PresentationRequestSecureOrigin = 1822,
     RtcpMuxPolicyNegotiate = 1823,
     DOMClobberedVariableAccessed = 1824,
     HTMLDocumentCreateProcessingInstruction = 1825,
     FetchResponseConstructionWithStream = 1826,
     LocationOrigin = 1827,
     DocumentOrigin = 1828,
     SubtleCryptoOnlyStrictSecureContextCheckFailed = 1829,
+    IDBObserver_Observe = 1830,

[jsbell, 2017/03/07 22:40:33]

We don't generally use _ in the enum members.

(The main exception is when you just use 'Measure' in the IDL and it generates
e.g. V8CSSRuleList_Item_Method. We do have a few others... most of which are my
fault. Oops.)

Maybe just use [Measure] and use the autogenerated name?
(V8IDBObserver_Observe_Method)

[dmurph, 2017/03/29 22:58:19]

Done.

+    IDBObserver_Unobserve = 1831,
 
     // 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.
   };
 
   // An interface to observe UseCounter changes. Note that this is never
   // notified when the counter is disabled by |m_muteCount| or
@@ skipping 89 matching lines @@
     // 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