Support UseCounter in dedicated workers.

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 260 matching lines @@
 
         TextAutosizing = 274,
         TextAutosizingLayout = 275,
         HTMLAnchorElementPingAttribute = 276,
         InsertAdjacentHTML = 278,
         SVGClassName = 279,
         HTMLAppletElement = 280,
         HTMLMediaElementSeekToFragmentStart = 281,
         HTMLMediaElementPauseAtFragmentEnd = 282,
         PrefixedWindowURL = 283,
-        PrefixedWorkerURL = 284,
+        PrefixedWorkerURL = 284, // This didn't work because of crbug.com/376039. Available since M37.
         WindowOrientation = 285,
         DOMStringListContains = 286,
         DocumentCaptureEvents = 287,
         DocumentReleaseEvents = 288,
         WindowCaptureEvents = 289,
         WindowReleaseEvents = 290,
         PrefixedGamepad = 291,
         ElementAnimateKeyframeListEffectObjectTiming = 292,
         ElementAnimateKeyframeListEffectDoubleTiming = 293,
         ElementAnimateKeyframeListEffectNoTiming = 294,
         DocumentXPathCreateExpression = 295,
         DocumentXPathCreateNSResolver = 296,
         DocumentXPathEvaluate = 297,
         AttrGetValue = 298,
         AttrSetValue = 299,
         AnimationConstructorKeyframeListEffectObjectTiming = 300,
         AnimationConstructorKeyframeListEffectDoubleTiming = 301,
         AnimationConstructorKeyframeListEffectNoTiming = 302,
         AttrSetValueWithElement = 303,
         PrefixedCancelAnimationFrame = 304,
         PrefixedCancelRequestAnimationFrame = 305,
         NamedNodeMapGetNamedItem = 306,
         NamedNodeMapSetNamedItem = 307,
         NamedNodeMapRemoveNamedItem = 308,
         NamedNodeMapItem = 309,
         NamedNodeMapGetNamedItemNS = 310,
         NamedNodeMapSetNamedItemNS = 311,
         NamedNodeMapRemoveNamedItemNS = 312,
-        OpenWebDatabaseInWorker = 313, // This doesn't work because of crbug.com/376039.
-        OpenWebDatabaseSyncInWorker = 314, // This doesn't work because of crbug.com/376039.
+        OpenWebDatabaseInWorker = 313, // This didn't work because of crbug.com/376039. Available since M37.
+        OpenWebDatabaseSyncInWorker = 314, // This didn't work because of crbug.com/376039. Available since M37.
         PrefixedAllowFullscreenAttribute = 315,
         XHRProgressEventPosition = 316,
         XHRProgressEventTotalSize = 317,
         PrefixedDocumentIsFullscreen = 318,
         PrefixedDocumentFullScreenKeyboardInputAllowed = 319,
         PrefixedDocumentCurrentFullScreenElement = 320,
         PrefixedDocumentCancelFullScreen = 321,
         PrefixedDocumentFullscreenEnabled = 322,
         PrefixedDocumentFullscreenElement = 323,
         PrefixedDocumentExitFullscreen = 324,
@@ skipping 149 matching lines @@
         CSSDeepCombinator = 471,
         // 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 non-Document ExecutionContext.
+    // This doesn't count for ExecutionContexts for shared workers and service
+    // workers.
     static void count(const ExecutionContext*, Feature);
     void count(CSSParserContext, CSSPropertyID);
     void count(Feature);
 
     // "countDeprecation" sets the bit for this feature to 1, and sends a deprecation
     // warning to the console. Repeated calls are ignored.
     //
-    // Be considerate to developers' consoles: features should only send deprecation warnings
-    // when we're actively interested in removing them from the platform.
+    // Be considerate to developers' consoles: features should only send
+    // deprecation warnings when we're actively interested in removing them from
+    // the platform.
+    //
+    // The ExecutionContext* overload doesn't work for shared workers and
+    // service workers.
     static void countDeprecation(const DOMWindow*, Feature);
     static void countDeprecation(ExecutionContext*, Feature);
     static void countDeprecation(const Document&, Feature);
     String deprecationMessage(Feature);
 
     void didCommitLoad();
 
     static UseCounter* getFrom(const Document*);
     static UseCounter* getFrom(const CSSStyleSheet*);
     static UseCounter* getFrom(const StyleSheetContents*);
@@ skipping 26 matching lines @@
 
     void updateMeasurements();
 
     OwnPtr<BitVector> m_countBits;
     BitVector m_CSSFeatureBits;
 };
 
 } // namespace WebCore
 
 #endif // UseCounter_h