AudioBufferSourceNode.buffer can only be set once.

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 596 matching lines @@
         GetUserMediaSecureOrigin = 667,
         DeviceMotionInsecureOrigin = 668,
         DeviceMotionSecureOrigin = 669,
         DeviceOrientationInsecureOrigin = 670,
         DeviceOrientationSecureOrigin = 671,
         SandboxViaIFrame = 672,
         SandboxViaCSP = 673,
         BlockedSniffingImageToScript = 674,
         Fetch = 675,
         FetchBodyStream = 676,
+        AudioBufferSourceBufferOnce = 677,
 
         // 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), 2015/01/21 22:58:46]

Don't forget to do this after committing.

         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