Check for NaN when creating a DelayNode for WebAudio

Source/modules/webaudio/DelayDSPKernel.cpp

Index: Source/modules/webaudio/DelayDSPKernel.cpp
diff --git a/Source/modules/webaudio/DelayDSPKernel.cpp b/Source/modules/webaudio/DelayDSPKernel.cpp
index 05b8cc566fdecd8cf9cdd3fc92a5c900456ee746..2301325f95b0cd34dd9a7dfedd0f6305224029b8 100644
--- a/Source/modules/webaudio/DelayDSPKernel.cpp
+++ b/Source/modules/webaudio/DelayDSPKernel.cpp
@@ -29,6 +29,7 @@
 #include "modules/webaudio/DelayDSPKernel.h"
 
 #include "platform/audio/AudioUtilities.h"
+#include "wtf/MathExtras.h"
 #include <algorithm>
 
 using namespace std;
@@ -45,8 +46,8 @@ DelayDSPKernel::DelayDSPKernel(DelayProcessor* processor)
         return;
 
     m_maxDelayTime = processor->maxDelayTime();
-    ASSERT(m_maxDelayTime >= 0);
-    if (m_maxDelayTime < 0)
+    ASSERT(m_maxDelayTime >= 0 && !std::isnan(m_maxDelayTime));
+    if (m_maxDelayTime < 0 || std::isnan(m_maxDelayTime))
         return;
 
     m_buffer.allocate(bufferLengthForDelay(m_maxDelayTime, processor->sampleRate()));