Web MIDI: dispatch MIDIConnectionEvent

Source/modules/webmidi/MIDIPort.cpp

Index: Source/modules/webmidi/MIDIPort.cpp
diff --git a/Source/modules/webmidi/MIDIPort.cpp b/Source/modules/webmidi/MIDIPort.cpp
index 240e570b21f10fa2de009ca011ba72c4b6584ff9..6364968167794e93a5d7d679263ddf5eb45ffcd0 100644
--- a/Source/modules/webmidi/MIDIPort.cpp
+++ b/Source/modules/webmidi/MIDIPort.cpp
@@ -32,6 +32,7 @@
 #include "modules/webmidi/MIDIPort.h"
 
 #include "modules/webmidi/MIDIAccess.h"
+#include "modules/webmidi/MIDIConnectionEvent.h"
 
 namespace blink {
 
@@ -61,6 +62,12 @@ String MIDIPort::type() const
     return emptyString();
 }
 
+void MIDIPort::setActiveState(bool isActive)
+{
+    m_isActive = isActive;
+    dispatchEvent(MIDIConnectionEvent::create(this));
+}
+
 ExecutionContext* MIDIPort::executionContext() const
 {
     return m_access->executionContext();