Add counters for all of the WebAudio nodes and important methods.

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 547 matching lines @@
         MixedContentPlugin = 616,
         MixedContentPrefetch = 617,
         MixedContentVideo = 618,
         CORSCredentialedNullOriginAccessAllowed = 619,
         AudioListenerDopplerFactor = 620,
         AudioListenerSpeedOfSound = 621,
         AudioListenerSetVelocity = 622,
         ShadowRootGetElementsByClassName = 623,
         ShadowRootGetElementsByTagName = 624,
         ShadowRootGetElementsByTagNameNS = 625,
+        AudioContextCreateAnalyser = 626,
+        AudioContextCreateBiquadFilter = 627,
+        AudioContextCreateBufferSource = 628,
+        AudioContextCreateChannelMerger = 629,
+        AudioContextCreateChannelSplitter = 630,
+        AudioContextCreateConvolver = 631,
+        AudioContextCreateDelay = 632,
+        AudioContextCreateDynamicsCompressor = 633,
+        AudioContextCreateGain = 634,
+        AudioContextCreateMediaElementSource = 635,
+        AudioContextCreateMediaStreamDestination = 636,
+        AudioContextCreateMediaStreamSource = 637,
+        AudioContextCreateOscillator = 638,
+        AudioContextCreatePanner = 639,
+        AudioContextCreatePeriodicWave = 640,
+        AudioContextCreateScriptProcessor = 641,
+        AudioContextCreateStereoPanner = 642,
+        AudioContextCreateWaveShaper = 643,
+        AudioContextDecodeAudioData = 644,
+        AudioContextResume = 645,
+        AudioContextSuspend = 646,
+        AudioContext = 647,
+        OfflineAudioContext = 648,
+        PrefixedAudioContext = 649,
+        PrefixedOfflineAudioContext = 650,
 
         // 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.

[Ken Russell (switch to Gerrit), 2014/12/17 00:44:30]

Please make sure to do this after this lands.

         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);
     static void count(const Document&, Feature);
     // This doesn't count for ExecutionContexts for shared workers and service
     // workers.
     static void count(const ExecutionContext*, Feature);
     // Use countIfNotPrivateScript() instead of count() if you don't want
@@ skipping 58 matching lines @@
 
     void updateMeasurements();
 
     OwnPtr<BitVector> m_countBits;
     BitVector m_CSSFeatureBits;
 };
 
 } // namespace blink
 
 #endif // UseCounter_h