Web MIDI: add blink APIs to notify device connection events

Source/modules/webmidi/MIDIAccessInitializer.cpp

Index: Source/modules/webmidi/MIDIAccessInitializer.cpp
diff --git a/Source/modules/webmidi/MIDIAccessInitializer.cpp b/Source/modules/webmidi/MIDIAccessInitializer.cpp
index b1d1013dac8e0aed3bef0d3238bbb74611a09c3a..2b0fee819902521982d9800fe75f28e499bc3bef 100644
--- a/Source/modules/webmidi/MIDIAccessInitializer.cpp
+++ b/Source/modules/webmidi/MIDIAccessInitializer.cpp
@@ -55,16 +55,30 @@ ScriptPromise MIDIAccessInitializer::start()
     return promise;
 }
 
-void MIDIAccessInitializer::didAddInputPort(const String& id, const String& manufacturer, const String& name, const String& version)
+void MIDIAccessInitializer::didAddInputPort(const String& id, const String& manufacturer, const String& name, const String& version, bool active)
 {
     ASSERT(m_accessor);
-    m_portDescriptors.append(PortDescriptor(id, manufacturer, name, MIDIPort::MIDIPortTypeInput, version));
+    m_portDescriptors.append(PortDescriptor(id, manufacturer, name, MIDIPort::MIDIPortTypeInput, version, active));
 }
 
-void MIDIAccessInitializer::didAddOutputPort(const String& id, const String& manufacturer, const String& name, const String& version)
+void MIDIAccessInitializer::didAddOutputPort(const String& id, const String& manufacturer, const String& name, const String& version, bool active)
 {
     ASSERT(m_accessor);
-    m_portDescriptors.append(PortDescriptor(id, manufacturer, name, MIDIPort::MIDIPortTypeOutput, version));
+    m_portDescriptors.append(PortDescriptor(id, manufacturer, name, MIDIPort::MIDIPortTypeOutput, version, active));
+}
+
+void MIDIAccessInitializer::didSetInputPortState(unsigned portIndex, bool active)
+{
+    // didSetInputPortState() is not allowed to call before didStartSession() is called.
+    // Once didStartSession() is called, MIDIAccessorClient methods are delegated to MIDIAccess.
+    // See constructor of MIDIAccess.
+    ASSERT_NOT_REACHED();
+}
+
+void MIDIAccessInitializer::didSetOutputPortState(unsigned portIndex, bool active)
+{
+    // See comments on didSetInputPortState().
+    ASSERT_NOT_REACHED();
 }
 
 void MIDIAccessInitializer::didStartSession(bool success, const String& error, const String& message)