Implement MIDIOutput.send()

Source/modules/webmidi/MIDIAccess.h

Index: Source/modules/webmidi/MIDIAccess.h
diff --git a/Source/modules/webmidi/MIDIAccess.h b/Source/modules/webmidi/MIDIAccess.h
index 595afceabf03f5a2aa90ec187998a4bdfa0e3877..390f528714b6f798a4f3c3e1ac14dd8c88cd3941 100644
--- a/Source/modules/webmidi/MIDIAccess.h
+++ b/Source/modules/webmidi/MIDIAccess.h
@@ -37,6 +37,7 @@
 #include "core/platform/midi/MIDIAccessor.h"
 #include "core/platform/midi/MIDIAccessorClient.h"
 #include "modules/webmidi/MIDIInput.h"
+#include "modules/webmidi/MIDIOptions.h"
 #include "modules/webmidi/MIDIOutput.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
@@ -76,6 +77,9 @@ public:
     virtual void didBlockAccess() OVERRIDE;
     virtual void didReceiveMIDIData(unsigned portIndex, const unsigned char* data, size_t length, double timeStamp) OVERRIDE;
 
+    // |timeStampInMilliseconds| is in the same time coordinate system as performance.now().
+    void sendMIDIData(unsigned portIndex, const unsigned char* data, size_t length, double timeStampInMilliseconds);
+
 private:
     explicit MIDIAccess(ScriptExecutionContext*, MIDIAccessPromise*);
 
@@ -92,6 +96,7 @@ private:
 
     OwnPtr<MIDIAccessor> m_accessor;
     bool m_hasAccess;
+    MIDIOptions m_midiOptions;
 };
 
 } // namespace WebCore