WebAudio createBuffer should throw error with 0 channels.

Source/modules/webaudio/AudioContext.cpp

 /*
  * Copyright (C) 2010, 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 257 matching lines @@
 }
 
 bool AudioContext::hasPendingActivity() const
 {
     // According to spec AudioContext must die only after page navigates.
     return !m_isCleared;
 }
 
 PassRefPtr<AudioBuffer> AudioContext::createBuffer(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate, ExceptionState& exceptionState)
 {
-    RefPtr<AudioBuffer> audioBuffer = AudioBuffer::create(numberOfChannels, numberOfFrames, sampleRate);
-    if (!audioBuffer.get()) {
-        if (numberOfChannels > AudioContext::maxNumberOfChannels()) {
-            exceptionState.throwDOMException(
-                NotSupportedError,
-                "requested number of channels (" + String::number(numberOfChannels) + ") exceeds maximum (" + String::number(AudioContext::maxNumberOfChannels()) + ")");
-        } else if (sampleRate < AudioBuffer::minAllowedSampleRate() || sampleRate > AudioBuffer::maxAllowedSampleRate()) {
-            exceptionState.throwDOMException(
-                NotSupportedError,
-                "requested sample rate (" + String::number(sampleRate)
-                + ") does not lie in the allowed range of "
-                + String::number(AudioBuffer::minAllowedSampleRate())
-                + "-" + String::number(AudioBuffer::maxAllowedSampleRate()) + " Hz");
-        } else if (!numberOfFrames) {
-            exceptionState.throwDOMException(
-                NotSupportedError,
-                "number of frames must be greater than 0.");
-        } else {
-            exceptionState.throwDOMException(
-                NotSupportedError,
-                "unable to create buffer of " + String::number(numberOfChannels)
-                + " channel(s) of " + String::number(numberOfFrames)
-                + " frames each.");
-        }
-        return nullptr;
-    }
+    RefPtr<AudioBuffer> audioBuffer = AudioBuffer::create(numberOfChannels, numberOfFrames, sampleRate, exceptionState);
 
     return audioBuffer;
 }
 
 void AudioContext::decodeAudioData(ArrayBuffer* audioData, PassOwnPtr<AudioBufferCallback> successCallback, PassOwnPtr<AudioBufferCallback> errorCallback, ExceptionState& exceptionState)
 {
     if (!audioData) {
         exceptionState.throwDOMException(
             SyntaxError,
             "invalid ArrayBuffer for audioData.");
@@ skipping 666 matching lines @@
     // Avoid firing the event if the document has already gone away.
     if (executionContext()) {
         // Call the offline rendering completion event listener.
         dispatchEvent(OfflineAudioCompletionEvent::create(renderedBuffer));
     }
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)