Store USB device permissions in website settings.

chrome/browser/usb/usb_chooser_permission_context.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_H_
+#define CHROME_BROWSER_USB_USB_CHOOSER_PERMISSION_CONTEXT_H_
+
+#include <map>
+#include <set>
+#include <string>
+
+#include "base/scoped_observer.h"
+#include "chrome/browser/permissions/chooser_permission_context_base.h"
+#include "device/usb/usb_service.h"
+
+class UsbChooserPermissionContext : public ChooserPermissionContextBase,
+                                    public device::UsbService::Observer {
+ public:
+  explicit UsbChooserPermissionContext(Profile* profile);
+  ~UsbChooserPermissionContext() override;
+
+  void GrantDevicePermission(const GURL& requesting_origin,
+                             const GURL& embedding_origin,
+                             const std::string& guid);
+  void RevokeDevicePermission(const GURL& requesting_origin,
+                              const GURL& embedding_origin,
+                              const std::string& guid);
+  bool HasDevicePermission(const GURL& requesting_origin,
+                           const GURL& embedding_origin,
+                           const std::string& guid);
+
+ private:
+  // device::UsbService::Observer implementation.
+  void OnDeviceRemoved(scoped_refptr<device::UsbDevice> device) override;
+
+  std::map<GURL, std::set<std::string>> ephemeral_devices_;
+  device::UsbService* usb_service_;
+  ScopedObserver<device::UsbService, device::UsbService::Observer> observer_;
+
+  DISALLOW_COPY_AND_ASSIGN(UsbChooserPermissionContext);
+};
+
+#endif  // CHROME_BROWSER_USB_USB_CHOOSER_PERMISSION_CONTEXT_H_