Add the Presentation API module and a single event target

Source/modules/presentation/NavigatorPresentation.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 NavigatorPresentation_h
+#define NavigatorPresentation_h
+
+#include "core/frame/DOMWindowProperty.h"
+#include "modules/presentation/Presentation.h"
+#include "platform/Supplementable.h"
+
+namespace blink {
+
+class Navigator;
+class Presentation;

[Peter Beverloo, 2014/07/25 18:01:18]

nit: You include Presentation.h, so no need to forward declare.

[whywhat, 2014/08/19 18:07:35]

Removed the header. Prefer to forward declare.

+
+class NavigatorPresentation FINAL
+    : public GarbageCollectedFinalized<NavigatorPresentation>

[Peter Beverloo, 2014/07/25 18:01:18]

mmm. It looks like every other module defining a partial Navigator interface
still uses NoBaseWillBeGarbageCollectedFinalized<> here. Let's go for parity?

[whywhat, 2014/08/19 18:07:35]

Done.

+    , public WillBeHeapSupplement<Navigator>
+    , public DOMWindowProperty {

[Peter Beverloo, 2014/07/25 18:01:17]

WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(NavigatorPresentation);

[whywhat, 2014/08/19 18:07:35]

Done.

+public:
+    virtual ~NavigatorPresentation();
+
+    static NavigatorPresentation& from(Navigator&);
+    static Presentation& presentation(Navigator&);
+
+    void trace(Visitor*) OVERRIDE;

[Peter Beverloo, 2014/07/25 18:01:18]

This should be virtual. The method will in fact be provided in the ancestry,
namely through HeapSupplement<> (which extends GarbageCollectedMixin, which
defines trace() as pure virtual).

[whywhat, 2014/08/19 18:07:35]

Done.

+
+private:
+    static const char* supplementName();
+
+    NavigatorPresentation(LocalFrame*);

[Peter Beverloo, 2014/07/25 18:01:17]

Constructors with only one argument should be marked as explicit.

[whywhat, 2014/08/19 18:07:34]

Done.

+
+    Presentation& presentation();
+
+    PersistentWillBeMember<Presentation> m_presentation;

[Peter Beverloo, 2014/07/25 18:01:17]

s/PersistentWillBeMember/Member/?

[whywhat, 2014/08/19 18:07:34]

Nah, let's go for consistency.

+};
+
+} // namespace blink
+
+#endif // NavigatorPresentation_h