[PresentationAPI] Added plumbing for start/joinSession from JS to platform

Source/modules/presentation/PresentationSession.h

 // 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.
 
 #ifndef PresentationSession_h
 #define PresentationSession_h
 
-#include "core/dom/ContextLifecycleObserver.h"
 #include "core/events/EventTarget.h"
+#include "core/frame/DOMWindowProperty.h"
 #include "wtf/text/AtomicString.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
+class Presentation;
+class WebPresentationSessionClient;
+class WebString;
+
 class PresentationSession final
     : public RefCountedGarbageCollectedEventTargetWithInlineData<PresentationSession>
-    , public ContextLifecycleObserver {
+    , public DOMWindowProperty {
     DEFINE_EVENT_TARGET_REFCOUNTING_WILL_BE_REMOVED(RefCountedGarbageCollected<PresentationSession>);
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(PresentationSession);
     DEFINE_WRAPPERTYPEINFO();
 public:
-    static PresentationSession* create(ExecutionContext*);
+    static PresentationSession* take(WebPresentationSessionClient*, Presentation*);
+    static void dispose(WebPresentationSessionClient*);
     virtual ~PresentationSession();
 
     // EventTarget implementation.
     virtual const AtomicString& interfaceName() const override;
     virtual ExecutionContext* executionContext() const override;
 
     DECLARE_VIRTUAL_TRACE();
 
     const String& id() const { return m_id; }
     const AtomicString& state() const { return m_state; }
 
     void postMessage(const String& message);
     void close();
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(message);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(statechange);
 
 private:
-    explicit PresentationSession(ExecutionContext*);
+    PresentationSession(LocalFrame*, const WebString& id);
 
     String m_id;
     AtomicString m_state;
 };
 
 } // namespace blink
 
 #endif // PresentationSession_h