Web MIDI: add blink APIs to notify device connection events

Source/modules/webmidi/MIDIAccess.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 59 matching lines @@
     bool sysexEnabled() const { return m_sysexEnabled; }
 
     // EventTarget
     virtual const AtomicString& interfaceName() const override { return EventTargetNames::MIDIAccess; }
     virtual ExecutionContext* executionContext() const override { return ActiveDOMObject::executionContext(); }
 
     // ActiveDOMObject
     virtual void stop() override;
 
     // MIDIAccessorClient
-    virtual void didAddInputPort(const String& id, const String& manufacturer, const String& name, const String& version) override;
-    virtual void didAddOutputPort(const String& id, const String& manufacturer, const String& name, const String& version) override;
+    virtual void didAddInputPort(const String& id, const String& manufacturer, const String& name, const String& version, bool isActive) override;
+    virtual void didAddOutputPort(const String& id, const String& manufacturer, const String& name, const String& version, bool isActive) override;
+    virtual void didSetInputPortState(unsigned portIndex, bool isActive) override;
+    virtual void didSetOutputPortState(unsigned portIndex, bool isActive) override;
     virtual void didStartSession(bool success, const String& error, const String& message) override
     {
         // This method is for MIDIAccess initialization: MIDIAccessInitializer
         // has the implementation.
         ASSERT_NOT_REACHED();
     }
     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);
 
     virtual void trace(Visitor*) override;
 
 private:
     MIDIAccess(PassOwnPtr<MIDIAccessor>, bool sysexEnabled, const Vector<MIDIAccessInitializer::PortDescriptor>&, ExecutionContext*);
 
     OwnPtr<MIDIAccessor> m_accessor;
     bool m_sysexEnabled;
     HeapVector<Member<MIDIInput> > m_inputs;
     HeapVector<Member<MIDIOutput> > m_outputs;
 };
 
 } // namespace blink
 
 #endif // MIDIAccess_h