Add the Presentation API module and a single event target

Source/modules/presentation/Presentation.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 Presentation_h
+#define Presentation_h
+
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "core/dom/ActiveDOMObject.h"
+
+namespace WebCore {
+
+class Presentation FINAL
+    : public GarbageCollectedFinalized<Presentation>
+    , public ScriptWrappable
+    , public ActiveDOMObject {

[Peter Beverloo, 2014/07/19 10:16:13]

This doesn't have to be an ActiveDOMObject in this patch yet, you should add it
when it's necessary. When you do, be sure to override hasPendingActivity() to
tell the GC whether it's safe to collect it regardless of traceability.

[whywhat, 2014/07/23 00:39:26]

Ok. Seems like it has to be something so I made it a DOMWindowProperty for now.

+public:
+    static Presentation* create(ExecutionContext*);
+    virtual ~Presentation();
+    void trace(Visitor*);

[Peter Beverloo, 2014/07/19 10:16:13]

virtual void trace(Visitor*) OVERRIDE;

[whywhat, 2014/07/23 00:39:26]

This is not declared in any of the base classes of this one :(

+
+    bool displayAvailable() const;
+
+private:
+    Presentation(ExecutionContext*);
+};
+
+} // namespace WebCore
+
+#endif // Presentation_h