Web MIDI: implement implicit open() on send() and setOnmidimessage()

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 4664eacf578c1c8652d811e0e37333136cf0b25a..35b05b0746addefafc6a1a2752bd116b20b5fd0f 100644
--- a/Source/modules/webmidi/MIDIPort.cpp
+++ b/Source/modules/webmidi/MIDIPort.cpp
@@ -99,22 +99,7 @@ String MIDIPort::type() const
 
 ScriptPromise MIDIPort::open(ScriptState* scriptState)
 {
-    if (m_connection == ConnectionStateClosed) {
-        switch (m_state) {
-        case PortState::MIDIPortStateDisconnected:
-            setStates(m_state, ConnectionStatePending);
-            break;
-        case PortState::MIDIPortStateConnected:
-            // TODO(toyoshim): Add blink API to perform a real open and close
-            // operation.
-            setStates(m_state, ConnectionStateOpen);
-            break;
-        case PortState::MIDIPortStateOpened:
-            // TODO(toyoshim): Remove PortState::MIDIPortStateOpened.
-            ASSERT_NOT_REACHED();
-            break;
-        }
-    }
+    open();
     return accept(scriptState);
 }
 
@@ -144,6 +129,26 @@ DEFINE_TRACE(MIDIPort)
     RefCountedGarbageCollectedEventTargetWithInlineData<MIDIPort>::trace(visitor);
 }
 
+void MIDIPort::open()
+{
+    if (m_connection == ConnectionStateClosed) {
+        switch (m_state) {
+        case PortState::MIDIPortStateDisconnected:
+            setStates(m_state, ConnectionStatePending);
+            break;
+        case PortState::MIDIPortStateConnected:
+            // TODO(toyoshim): Add blink API to perform a real open and close
+            // operation.
+            setStates(m_state, ConnectionStateOpen);
+            break;
+        case PortState::MIDIPortStateOpened:
+            // TODO(toyoshim): Remove PortState::MIDIPortStateOpened.
+            ASSERT_NOT_REACHED();
+            break;
+        }
+    }
+}
+
 ScriptPromise MIDIPort::accept(ScriptState* scriptState)
 {
     return ScriptPromise::cast(scriptState, toV8(this, scriptState->context()->Global(), scriptState->isolate()));