Fix crash when the OfflineAudioContext constructor is given 0 as numberOfFrames

Source/modules/webaudio/OfflineAudioContext.cpp

Index: Source/modules/webaudio/OfflineAudioContext.cpp
diff --git a/Source/modules/webaudio/OfflineAudioContext.cpp b/Source/modules/webaudio/OfflineAudioContext.cpp
index 832a57aed982813af53ac1a6141df488242c6c62..5a2860af5ae391a4e212f5be7ef128540a1e5334 100644
--- a/Source/modules/webaudio/OfflineAudioContext.cpp
+++ b/Source/modules/webaudio/OfflineAudioContext.cpp
@@ -48,6 +48,15 @@ PassRefPtr<OfflineAudioContext> OfflineAudioContext::create(ExecutionContext* co
 
     Document* document = toDocument(context);
 
+    if (!numberOfFrames) {
+        es.throwDOMException(
+            SyntaxError,
+            ExceptionMessages::failedToConstruct(
+                "OfflineAudioContext",
+                "number of frames cannot be zero."));
+        return 0;
+    }
+
     if (numberOfChannels > 10) {
         es.throwDOMException(
             SyntaxError,