Add more informative messages for DOM exceptions.

Source/modules/webaudio/DelayNode.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/DelayNode.h"
 
+#include "bindings/v8/ExceptionMessages.h"
 #include "bindings/v8/ExceptionState.h"
 #include "core/dom/ExceptionCode.h"
 
 namespace WebCore {
 
 const double maximumAllowedDelayTime = 180;
 
 DelayNode::DelayNode(AudioContext* context, float sampleRate, double maxDelayTime, ExceptionState& es)
     : AudioBasicProcessorNode(context, sampleRate)
 {
     ScriptWrappable::init(this);
     if (maxDelayTime <= 0 || maxDelayTime >= maximumAllowedDelayTime) {
-        es.throwUninformativeAndGenericDOMException(NotSupportedError);
+        es.throwDOMException(
+            NotSupportedError,
+            ExceptionMessages::failedToConstruct(
+                "DelayNode",
+                "invalid max delay time."));

[Mike West, 2013/09/27 06:44:39]

Same as above.

         return;
     }
     m_processor = adoptPtr(new DelayProcessor(context, sampleRate, 1, maxDelayTime));
     setNodeType(NodeTypeDelay);
 }
 
 AudioParam* DelayNode::delayTime()
 {
     return delayProcessor()->delayTime();
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)