Cancel MIDI permission request infobar on MIDIAccess stop.

content/public/browser/midi_permission_context.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_BROWSER_MIDI_MIDI_PERMISSION_CONTEXT_H_
+#define CONTENT_BROWSER_MIDI_MIDI_PERMISSION_CONTEXT_H_
+
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "content/common/content_export.h"
+
+class GURL;
+
+namespace content {
+
+typedef base::Callback<void(bool)> MIDISysExPermissionCallback;
+
+// MidiPermissionContext must be implemented by the embedder, to provide
+// the policy and logic for the Midi permissions flow.
+// This includes both prompting the user and persisting results, as required.
+class CONTENT_EXPORT MidiPermissionContext
+    : public base::RefCountedThreadSafe<MidiPermissionContext> {

[jam, 2013/10/24 16:15:26]

does this have to be ref counted? please avoid ref counting where possible

[Kibeom Kim (inactive), 2013/10/24 19:36:26]

Done.

+ public:
+  // The renderer is requesting permission to use Midi.
+  // When the answer to a permission request has been determined, |callback|
+  // should be called with the result.
+  virtual void RequestMIDISysExPermission(
+      int render_process_id,
+      int render_view_id,
+      int bridge_id,
+      const GURL& requesting_frame,
+      const MIDISysExPermissionCallback& callback) = 0;
+
+  // The renderer is cancelling a pending permission request.
+  virtual void CancelMIDISysExPermissionRequest(
+      int render_process_id,
+      int render_view_id,
+      int bridge_id,
+      const GURL& requesting_frame) = 0;
+
+ protected:
+   virtual ~MidiPermissionContext() {}

[Bernhard Bauer, 2013/10/24 07:42:04]

Nit: one less space

[Kibeom Kim (inactive), 2013/10/24 19:36:26]

Done.

+
+ private:
+  friend class base::RefCountedThreadSafe<MidiPermissionContext>;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_MIDI_MIDI_CONTEXT_H_