Media Capabilities: stub implementation of mediaCapabilities.query().

third_party/WebKit/Source/modules/mediacapabilities/NavigatorMediaCapabilities.h

+// Copyright 2017 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 NavigatorMediaCapabilities_h
+#define NavigatorMediaCapabilities_h
+
+#include "core/frame/Navigator.h"
+#include "platform/Supplementable.h"
+
+namespace blink {
+
+class MediaCapabilities;
+class Navigator;
+
+// Provides MediaCapabilities as a supplement of Navigator as an attribute.
+class NavigatorMediaCapabilities final
+    : public GarbageCollected<NavigatorMediaCapabilities>,
+      public Supplement<Navigator> {
+  USING_GARBAGE_COLLECTED_MIXIN(NavigatorMediaCapabilities);
+
+ public:
+  static MediaCapabilities* mediaCapabilities(Navigator&);
+
+  DECLARE_TRACE();
+
+ private:
+  explicit NavigatorMediaCapabilities(Navigator&);
+
+  static NavigatorMediaCapabilities& from(Navigator&);
+  static const char* supplementName();
+
+  // The MediaCapabilities instance of this Navigator.
+  Member<MediaCapabilities> m_capabilities;
+};
+
+}  // namespace blink
+
+#endif  // NavigatorMediaCapabilities_h