Store USB device permissions in website settings.

chrome/browser/usb/usb_chooser_permission_context_factory.h

+// Copyright 2015 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_USB_USB_CHOOSER_PERMISSION_CONTEXT_FACTORY_H_
+#define CHROME_BROWSER_USB_USB_CHOOSER_PERMISSION_CONTEXT_FACTORY_H_
+
+#include "base/memory/singleton.h"
+#include "chrome/browser/permissions/permission_context_factory_base.h"
+#include "components/content_settings/core/common/content_settings_types.h"
+
+class UsbChooserPermissionContext;
+class Profile;
+
+class UsbChooserPermissionContextFactory : public PermissionContextFactoryBase {

[raymes, 2015/10/14 02:07:04]

It doesn't seem great to get the two things tangled here by inheriting from
PermissionContextFactoryBase. Could we instead just inherit from
BrowserContextKeyedServiceFactory or if really necessary, create a new
superclass.

[Reilly Grant (use Gerrit), 2015/10/22 00:57:03]

Done.

+ public:
+  static UsbChooserPermissionContext* GetForProfile(Profile* profile);
+  static UsbChooserPermissionContextFactory* GetInstance();
+
+ private:
+  friend struct base::DefaultSingletonTraits<
+      UsbChooserPermissionContextFactory>;
+
+  UsbChooserPermissionContextFactory();
+  ~UsbChooserPermissionContextFactory() override;
+
+  // BrowserContextKeyedBaseFactory methods:
+  KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* profile) const override;
+
+  DISALLOW_COPY_AND_ASSIGN(UsbChooserPermissionContextFactory);
+};
+
+#endif  // CHROME_BROWSER_USB_USB_CHOOSER_PERMISSION_CONTEXT_FACTORY_H_