Reland: Web MIDI: use mojom::blink::PermissionService directly to ask permission

content/renderer/media/midi_dispatcher.h

-// Copyright 2013 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 CONTENT_RENDERER_MEDIA_MIDI_DISPATCHER_H_
-#define CONTENT_RENDERER_MEDIA_MIDI_DISPATCHER_H_
-
-#include "base/id_map.h"
-#include "base/macros.h"
-#include "content/public/renderer/render_frame_observer.h"
-#include "third_party/WebKit/public/platform/modules/permissions/permission.mojom.h"
-#include "third_party/WebKit/public/web/modules/webmidi/WebMIDIClient.h"
-
-namespace blink {
-class WebMIDIPermissionRequest;
-}
-
-namespace content {
-
-// MidiDispatcher implements WebMIDIClient to handle permissions for using
-// system exclusive messages.
-// It works as RenderFrameObserver to keep a 1:1 relationship with a RenderFrame
-// and make sure it has the same life cycle.
-class MidiDispatcher : public RenderFrameObserver,
-                       public blink::WebMIDIClient {
- public:
-  explicit MidiDispatcher(RenderFrame* render_frame);
-  ~MidiDispatcher() override;
-
- private:
-  // RenderFrameObserver implementation.
-  void OnDestruct() override;
-
-  // blink::WebMIDIClient implementation.
-  void requestPermission(const blink::WebMIDIPermissionRequest& request,
-                         const blink::WebMIDIOptions& options) override;
-  void cancelPermissionRequest(
-      const blink::WebMIDIPermissionRequest& request) override;
-
-  // Permission for using MIDI system has been set.
-  void OnPermissionSet(int request_id, blink::mojom::PermissionStatus status);
-
-  // Each WebMIDIPermissionRequest object is valid until
-  // cancelSysexPermissionRequest() is called with the object, or used to call
-  // WebMIDIPermissionRequest::setIsAllowed().
-  typedef IDMap<blink::WebMIDIPermissionRequest, IDMapOwnPointer> Requests;
-  Requests requests_;
-
-  blink::mojom::PermissionServicePtr permission_service_;
-
-  DISALLOW_COPY_AND_ASSIGN(MidiDispatcher);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_RENDERER_MEDIA_MIDI_DISPATCHER_H_