Add more informative messages for DOM exceptions.

Source/modules/webaudio/AnalyserNode.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 10 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 
 #if ENABLE(WEB_AUDIO)
 
 #include "modules/webaudio/AnalyserNode.h"
 
+#include "bindings/v8/ExceptionMessages.h"
 #include "bindings/v8/ExceptionState.h"
 #include "core/dom/ExceptionCode.h"
 #include "modules/webaudio/AudioNodeInput.h"
 #include "modules/webaudio/AudioNodeOutput.h"
 
 namespace WebCore {
 
 AnalyserNode::AnalyserNode(AudioContext* context, float sampleRate)
     : AudioBasicInspectorNode(context, sampleRate, 2)
 {
@@ skipping 27 matching lines @@
         outputBus->copyFrom(*inputBus);
 }
 
 void AnalyserNode::reset()
 {
     m_analyser.reset();
 }
 
 void AnalyserNode::setFftSize(unsigned size, ExceptionState& es)
 {
-    if (!m_analyser.setFftSize(size))
-        es.throwUninformativeAndGenericDOMException(NotSupportedError);
+    if (!m_analyser.setFftSize(size)) {
+        es.throwDOMException(
+            NotSupportedError,
+            ExceptionMessages::failedToSet(
+                "fftSize",
+                "AnalyserNode",
+                "FFT size is out of range or not a power of two."));
+    }
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)