Convert MIDI permission requests to use WebContents in preparation for switching the code to using …

content/browser/renderer_host/media/midi_host.h

-// Copyright (c) 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_BROWSER_RENDERER_HOST_MEDIA_MIDI_HOST_H_
-#define CONTENT_BROWSER_RENDERER_HOST_MEDIA_MIDI_HOST_H_
-
-#include <vector>
-
-#include "base/gtest_prod_util.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/scoped_vector.h"
-#include "content/common/content_export.h"
-#include "content/public/browser/browser_message_filter.h"
-#include "content/public/browser/browser_thread.h"
-#include "media/midi/midi_manager.h"
-
-namespace media {
-class MidiManager;
-class MidiMessageQueue;
-}
-
-namespace content {
-
-class CONTENT_EXPORT MidiHost
-    : public BrowserMessageFilter,
-      public media::MidiManagerClient {
- public:
-  // Called from UI thread from the owner of this object.
-  MidiHost(int renderer_process_id, media::MidiManager* midi_manager);
-
-  // BrowserMessageFilter implementation.
-  virtual void OnDestruct() const OVERRIDE;
-  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
-
-  // MidiManagerClient implementation.
-  virtual void CompleteStartSession(int client_id,
-                                    media::MidiResult result) OVERRIDE;
-  virtual void ReceiveMidiData(uint32 port,
-                               const uint8* data,
-                               size_t length,
-                               double timestamp) OVERRIDE;
-  virtual void AccumulateMidiBytesSent(size_t n) OVERRIDE;
-
-  // Start session to access MIDI hardware.
-  void OnStartSession(int client_id);
-
-  // Data to be sent to a MIDI output port.
-  void OnSendData(uint32 port,
-                  const std::vector<uint8>& data,
-                  double timestamp);
-
- private:
-  FRIEND_TEST_ALL_PREFIXES(MidiHostTest, IsValidWebMIDIData);
-  friend class base::DeleteHelper<MidiHost>;
-  friend class BrowserThread;
-
-  virtual ~MidiHost();
-
-  // Returns true if |data| fulfills the requirements of MidiOutput.send API
-  // defined in the WebMIDI spec.
-  // - |data| must be any number of complete MIDI messages (data abbreviation
-  //    called "running status" is disallowed).
-  // - 1-byte MIDI realtime messages can be placed at any position of |data|.
-  static bool IsValidWebMIDIData(const std::vector<uint8>& data);
-
-  int renderer_process_id_;
-
-  // Represents if the renderer has a permission to send/receive MIDI SysEX
-  // messages.
-  bool has_sys_ex_permission_;
-
-  // |midi_manager_| talks to the platform-specific MIDI APIs.
-  // It can be NULL if the platform (or our current implementation)
-  // does not support MIDI.  If not supported then a call to
-  // OnRequestAccess() will always refuse access and a call to
-  // OnSendData() will do nothing.
-  media::MidiManager* const midi_manager_;
-
-  // Buffers where data sent from each MIDI input port is stored.
-  ScopedVector<media::MidiMessageQueue> received_messages_queues_;
-
-  // The number of bytes sent to the platform-specific MIDI sending
-  // system, but not yet completed.
-  size_t sent_bytes_in_flight_;
-
-  // The number of bytes successfully sent since the last time
-  // we've acknowledged back to the renderer.
-  size_t bytes_sent_since_last_acknowledgement_;
-
-  // Protects access to |sent_bytes_in_flight_|.
-  base::Lock in_flight_lock_;
-
-  DISALLOW_COPY_AND_ASSIGN(MidiHost);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MIDI_HOST_H_