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 615e9e4db78ed3853f2dcccfe66b2f337f3fdf0f..d0a286cc61e5495b9d06bef18ad77223f7e9a08c 100644
--- a/Source/modules/webmidi/MIDIAccess.h
+++ b/Source/modules/webmidi/MIDIAccess.h
@@ -61,7 +61,8 @@ public:
     DEFINE_ATTRIBUTE_EVENT_LISTENER(connect);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(disconnect);
 
-    void enableSysEx(bool enable);
+    void setSysExEnabled(bool);
+    bool sysExEnabled() const { return m_sysExEnabled; }
 
     // EventTarget
     virtual const AtomicString& interfaceName() const OVERRIDE { return eventNames().interfaceForMIDIAccess; }
@@ -77,6 +78,9 @@ public:
     virtual void didStartSession() 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*);
 
@@ -96,7 +100,7 @@ private:
 
     OwnPtr<MIDIAccessor> m_accessor;
     bool m_hasAccess;
-    bool m_enableSysEx;
+    bool m_sysExEnabled;
     bool m_requesting;
 };