media: Add mojo MediaPermission service

media/mojo/services/mojo_media_permission.h

+// Copyright 2016 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 MEDIA_MOJO_SERVICES_MOJO_MEDIA_PERMISSION_H_
+#define MEDIA_MOJO_SERVICES_MOJO_MEDIA_PERMISSION_H_
+
+#include "base/macros.h"
+#include "media/base/media_permission.h"
+#include "media/mojo/interfaces/media_permission.mojom.h"
+#include "url/gurl.h"
+
+namespace mojo {
+namespace shell {
+namespace mojom {
+class InterfaceProvider;
+}
+}
+}
+
+namespace media {
+
+// A MediaPermission that proxies to a interfaces::MediaPermissionPtr.
+// The connection is lazily initialized.
+class MojoMediaPermission : public MediaPermission {
+ public:
+  explicit MojoMediaPermission(
+      mojo::shell::mojom::InterfaceProvider* interface_provider);
+  ~MojoMediaPermission() final;
+
+  // MediaPermission implementation:
+  void HasPermission(Type type,
+                     const GURL& security_origin,
+                     const PermissionStatusCB& permission_status_cb) final;
+
+  void RequestPermission(Type type,
+                         const GURL& security_origin,
+                         const PermissionStatusCB& permission_status_cb) final;
+
+ private:
+  interfaces::MediaPermission* GetMediaPermission();
+
+  // Callback for HasPermission() and RequestPermission();
+  void OnPermissionStatus(const base::Callback<void(bool)>& callback,
+                          bool success);
+
+  mojo::shell::mojom::InterfaceProvider* interface_provider_;
+
+  // Lazily initialized.
+  interfaces::MediaPermissionPtr media_permission_ptr_;
+
+  DISALLOW_COPY_AND_ASSIGN(MojoMediaPermission);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_MOJO_SERVICES_MOJO_MEDIA_PERMISSION_H_