Store USB device permissions in website settings.

chrome/browser/usb/web_usb_permission_store.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_WEB_USB_PERMISSION_STORE_H_
+#define CHROME_BROWSER_USB_WEB_USB_PERMISSION_STORE_H_
+
+#include <map>
+#include <set>
+#include <string>
+
+#include "base/memory/ref_counted.h"
+#include "base/scoped_observer.h"
+#include "components/keyed_service/core/keyed_service.h"
+#include "device/usb/usb_service.h"
+#include "url/gurl.h"

[Bernhard Bauer, 2015/10/01 08:31:25]

You could forward-declare GURL.

+
+namespace content {
+class BrowserContext;
+}
+
+class HostContentSettingsMap;
+
+class WebUSBPermissionStore : public KeyedService,

[raymes, 2015/10/01 01:28:19]

I'd feel more comfortable if we had a ChooserPermissionStore which was used for
chooser-based APIs (or some plan for sharing code with bluetooth :)

+                              public device::UsbService::Observer {
+ public:
+  static WebUSBPermissionStore* Get(content::BrowserContext* browser_context);
+
+  explicit WebUSBPermissionStore(content::BrowserContext* browser_context);
+  ~WebUSBPermissionStore() override;
+
+  void GrantDevicePermission(const GURL& origin, const std::string& guid);
+  void RevokeDevicePermission(const GURL& origin, const std::string& guid);
+  bool HasDevicePermission(const GURL& 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_;
+  HostContentSettingsMap* host_content_settings_map_;
+  device::UsbService* usb_service_;
+  ScopedObserver<device::UsbService, device::UsbService::Observer> observer_;
+};

[Ken Rockot(use gerrit already), 2015/10/01 01:26:32]

nit: DISALLOW_COPY_AND_ASSIGN

+
+#endif  // CHROME_BROWSER_USB_WEB_USB_PERMISSION_STORE_H_