[PresentationAPI] Plumbing |onstatechange| event for the PresentationSession from Blink to platform/

Source/modules/presentation/Presentation.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "modules/presentation/Presentation.h"
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/frame/LocalFrame.h"
 #include "modules/EventTargetModules.h"
 #include "modules/presentation/AvailableChangeEvent.h"
 #include "modules/presentation/DefaultSessionStartEvent.h"
 #include "modules/presentation/PresentationController.h"
 #include "modules/presentation/PresentationSessionClientCallbacks.h"
+#include "public/platform/modules/presentation/WebPresentationSessionClient.h"
 
 namespace blink {
 
 Presentation::Presentation(LocalFrame* frame)
     : DOMWindowProperty(frame)
 {
 }
 
 Presentation::~Presentation()
 {
@@ skipping 114 matching lines @@
 bool Presentation::isAvailableChangeWatched() const
 {
     return hasEventListeners(EventTypeNames::availablechange);
 }
 
 void Presentation::didStartDefaultSession(PresentationSession* session)
 {
     dispatchEvent(DefaultSessionStartEvent::create(EventTypeNames::defaultsessionstart, session));
 }
 
+void Presentation::didChangeSessionState(WebPresentationSessionClient* sessionClient, WebPresentationSessionState sessionState)
+{
+    PresentationSession* session = findSession(sessionClient);
+    if (session)
+        session->didChangeState(sessionState);
+
+    PresentationSession::dispose(sessionClient);
+}
+
 void Presentation::registerSession(PresentationSession* session)
 {
     m_openSessions.add(session);
 }
 
 PresentationController* Presentation::presentationController()
 {
     if (!frame())
         return nullptr;
     return PresentationController::from(*frame());
 }
 
+PresentationSession* Presentation::findSession(WebPresentationSessionClient* sessionClient)
+{
+    for (const auto& session : m_openSessions) {
+        if (session->matches(sessionClient))
+            return session.get();
+    }
+    return nullptr;
+}
+
 } // namespace blink