Add ETW support for arrays

internal/etw/eventdata.go

@@ -2,6 +2,7 @@ package etw
 
 import (
 	"bytes"
+	"encoding/binary"
 )
 
 // EventData maintains a buffer which builds up the data for an ETW event. It
@@ -20,3 +21,10 @@ func (ed *EventData) AddString(data string) {
 	ed.buffer.WriteString(data)
 	ed.buffer.WriteByte(0)
 }
+
+// This is mostly added for testing purposes, and will be removed later, as we
+// shouldn't take a dependency on binary.Write knowing how to marshal values
+// correctly for TraceLogging.
+func (ed *EventData) AddSimple(data interface{}) {
+	binary.Write(&ed.buffer, binary.LittleEndian, data)
+}