Web MIDI: implement permission infobar

chrome/browser/media/chrome_midi_permission_context_factory.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 CHROME_BROWSER_MEDIA_CHROME_MIDI_PERMISSION_CONTEXT_FACTORY_H_
+#define CHROME_BROWSER_MEDIA_CHROME_MIDI_PERMISSION_CONTEXT_FACTORY_H_
+
+#include "base/memory/singleton.h"
+#include "components/browser_context_keyed_service/browser_context_keyed_service_factory.h"
+
+class ChromeMIDIPermissionContext;
+class Profile;
+
+class ChromeMIDIPermissionContextFactory
+    : public BrowserContextKeyedServiceFactory {
+ public:
+  static ChromeMIDIPermissionContext* GetForProfile(Profile* profile);
+  static ChromeMIDIPermissionContextFactory* GetInstance();
+
+ private:
+  friend struct DefaultSingletonTraits<ChromeMIDIPermissionContextFactory>;
+
+  ChromeMIDIPermissionContextFactory();
+  virtual ~ChromeMIDIPermissionContextFactory();
+
+  // BrowserContextKeyedBaseFactory methods:
+  virtual BrowserContextKeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* profile) const OVERRIDE;
+  virtual content::BrowserContext* GetBrowserContextToUse(
+      content::BrowserContext* context) const OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeMIDIPermissionContextFactory);
+};
+
+#endif  // CHROME_BROWSER_MEDIA_CHROME_MIDI_PERMISSION_CONTEXT_FACTORY_H_