Fix attributes types on AnalyserNode as specification of web audio.

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 62 matching lines @@
 {
     if (!m_analyser.setFftSize(size)) {
         exceptionState.throwDOMException(
             IndexSizeError,
             (size < RealtimeAnalyser::MinFFTSize || size > RealtimeAnalyser::MaxFFTSize) ?
                 ExceptionMessages::indexOutsideRange("FFT size", size, RealtimeAnalyser::MinFFTSize, ExceptionMessages::InclusiveBound, RealtimeAnalyser::MaxFFTSize, ExceptionMessages::InclusiveBound)
                 : ("The value provided (" + String::number(size) + ") is not a power of two."));
     }
 }
 
-void AnalyserNode::setMinDecibels(float k, ExceptionState& exceptionState)
+void AnalyserNode::setMinDecibels(double k, ExceptionState& exceptionState)
 {
-    if (k <= maxDecibels()) {
+    if (k < maxDecibels()) {
         m_analyser.setMinDecibels(k);
     } else {
         exceptionState.throwDOMException(
             IndexSizeError,
             ExceptionMessages::indexExceedsMaximumBound("minDecibels", k, maxDecibels()));
     }
 }
 
-void AnalyserNode::setMaxDecibels(float k, ExceptionState& exceptionState)
+void AnalyserNode::setMaxDecibels(double k, ExceptionState& exceptionState)
 {
-    if (k >= minDecibels()) {
+    if (k > minDecibels()) {
         m_analyser.setMaxDecibels(k);
     } else {
         exceptionState.throwDOMException(
             IndexSizeError,
             ExceptionMessages::indexExceedsMinimumBound("maxDecibels", k, minDecibels()));
     }
 }
 
-void AnalyserNode::setSmoothingTimeConstant(float k, ExceptionState& exceptionState)
+void AnalyserNode::setSmoothingTimeConstant(double k, ExceptionState& exceptionState)
 {
     if (k >= 0 && k <= 1) {
         m_analyser.setSmoothingTimeConstant(k);
     } else {
         exceptionState.throwDOMException(
             IndexSizeError,
-            ExceptionMessages::indexOutsideRange("smoothing value", k, 0.0f, ExceptionMessages::InclusiveBound, 1.0f, ExceptionMessages::InclusiveBound));
+            ExceptionMessages::indexOutsideRange("smoothing value", k, 0.0, ExceptionMessages::InclusiveBound, 1.0, ExceptionMessages::InclusiveBound));
     }
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)