AudioBufferSourceNode.buffer can only be set once.

Source/core/frame/UseCounter.cpp

 
 /*
  * 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
@@ skipping 812 matching lines @@
 
     case PrefixedOfflineAudioContext:
         return replacedBy("webkitOfflineAudioContext", "OfflineAudioContext");
 
     case RangeCompareNode:
         return replacedBy("Range.compareNode()", "Range.compareBoundaryPoints()");
 
     case RangeExpand:
         return replacedBy("Range.expand()", "Selection.modify()");
 
+    case AudioBufferSourceBufferOnce:
+        return "Setting AudioBufferSourceNode.buffer more than once is deprecated and will no longer work in M45.";

[Ken Russell (switch to Gerrit), 2015/01/21 22:58:46]

Better to say "Chrome 45"? Also, feel free to pull move this up to an earlier
release like Chrome 43. Also please communicate this change as widely as
possible on public mailing lists.

[Raymond Toy, 2015/01/21 23:16:27]

Chrome 43 it is.  Will add entry to the chrome status dashboard

+
     // Features that aren't deprecated don't have a deprecation message.
     default:
         return String();
     }
 }
 
 void UseCounter::count(CSSParserContext context, CSSPropertyID feature)
 {
     ASSERT(feature >= firstCSSProperty);
     ASSERT(feature <= lastCSSProperty);
@@ skipping 28 matching lines @@
 UseCounter* UseCounter::getFrom(const StyleSheetContents* sheetContents)
 {
     // FIXME: We may want to handle stylesheets that have multiple owners
     //        http://crbug.com/242125
     if (sheetContents && sheetContents->hasSingleOwnerNode())
         return getFrom(sheetContents->singleOwnerDocument());
     return 0;
 }
 
 } // namespace blink