Introduce KeepAliveWhilePending to ScriptPromiseResolverWithContext.

Source/modules/webmidi/NavigatorWebMIDI.cpp

Index: Source/modules/webmidi/NavigatorWebMIDI.cpp
diff --git a/Source/modules/webmidi/NavigatorWebMIDI.cpp b/Source/modules/webmidi/NavigatorWebMIDI.cpp
index 4e34e8fac98c57b06d9cd1a476c6c2c17696c59e..1ee4e6af20e6b2fb9fcfdc217b4f72fad13d3452 100644
--- a/Source/modules/webmidi/NavigatorWebMIDI.cpp
+++ b/Source/modules/webmidi/NavigatorWebMIDI.cpp
@@ -37,7 +37,7 @@
 #include "core/dom/Document.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Navigator.h"
-#include "modules/webmidi/MIDIAccess.h"
+#include "modules/webmidi/MIDIAccessInitializer.h"
 #include "modules/webmidi/MIDIOptions.h"
 
 namespace WebCore {
@@ -68,10 +68,10 @@ NavigatorWebMIDI& NavigatorWebMIDI::from(Navigator& navigator)
 
 ScriptPromise NavigatorWebMIDI::requestMIDIAccess(ScriptState* scriptState, Navigator& navigator, const Dictionary& options)
 {
-    return NavigatorWebMIDI::from(navigator).requestMIDIAccess(scriptState, options);
+    return NavigatorWebMIDI::from(navigator).requestMIDIAccessInternal(scriptState, navigator, options);
 }
 
-ScriptPromise NavigatorWebMIDI::requestMIDIAccess(ScriptState* scriptState, const Dictionary& options)
+ScriptPromise NavigatorWebMIDI::requestMIDIAccessInternal(ScriptState* scriptState, Navigator& navigator, const Dictionary& options)
 {
     if (!frame() || frame()->document()->activeDOMObjectsAreStopped()) {
         RefPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(scriptState);
@@ -81,7 +81,21 @@ ScriptPromise NavigatorWebMIDI::requestMIDIAccess(ScriptState* scriptState, cons
         return promise;
     }
 
-    return MIDIAccess::request(MIDIOptions(options), scriptState);
+    const OwnPtr<MIDIAccessInitializer>& initializer =
+        *m_initializers.add(MIDIAccessInitializer::create(scriptState, MIDIOptions(options), &navigator, this)).storedValue;
+    return initializer->start();
+}
+
+void NavigatorWebMIDI::didFinishMIDIAccessInitialization(MIDIAccessInitializer* initializer)
+{
+    if (m_initializers.contains(initializer))
+        m_initializers.remove(initializer);
+}
+
+void NavigatorWebMIDI::didFailMIDIAccessInitialization(MIDIAccessInitializer* initializer)
+{
+    if (m_initializers.contains(initializer))
+        m_initializers.remove(initializer);
 }
 
 } // namespace WebCore