[SharedArrayBuffer] Prevent SharedArrayBuffer being used in Web APIs

third_party/WebKit/Source/modules/webmidi/MIDIOutput.cpp

Index: third_party/WebKit/Source/modules/webmidi/MIDIOutput.cpp
diff --git a/third_party/WebKit/Source/modules/webmidi/MIDIOutput.cpp b/third_party/WebKit/Source/modules/webmidi/MIDIOutput.cpp
index 576b0adc19411c9eca911e46b2ddb62fa9a50a3c..ae35c35e4a07bc7dc369323e1a20bc3af440d30c 100644
--- a/third_party/WebKit/Source/modules/webmidi/MIDIOutput.cpp
+++ b/third_party/WebKit/Source/modules/webmidi/MIDIOutput.cpp
@@ -221,10 +221,16 @@ MIDIOutput::MIDIOutput(MIDIAccess* access,
 
 MIDIOutput::~MIDIOutput() {}
 
-void MIDIOutput::send(DOMUint8Array* array,
+void MIDIOutput::send(const MaybeShared<DOMUint8Array>& maybeShared,
                       double timestamp,
                       ExceptionState& exceptionState) {
-  DCHECK(array);
+  DCHECK(maybeShared);
+  if (maybeShared.isShared()) {
+    exceptionState.throwTypeError(
+        "The array is backed by a SharedArrayBuffer.");
+    return;
+  }
+  DOMUint8Array* array = maybeShared.viewNotShared();
 
   if (timestamp == 0.0)
     timestamp = now(getExecutionContext());
@@ -263,7 +269,8 @@ void MIDIOutput::send(Vector<unsigned> unsignedData,
   send(array, timestamp, exceptionState);
 }
 
-void MIDIOutput::send(DOMUint8Array* data, ExceptionState& exceptionState) {
+void MIDIOutput::send(const MaybeShared<DOMUint8Array>& data,
+                      ExceptionState& exceptionState) {
   DCHECK(data);
   send(data, 0.0, exceptionState);
 }