Store USB device permissions in website settings.

chrome/browser/usb/usb_chooser_context.h

Index: chrome/browser/usb/usb_chooser_context.h
diff --git a/chrome/browser/usb/usb_chooser_context.h b/chrome/browser/usb/usb_chooser_context.h
new file mode 100644
index 0000000000000000000000000000000000000000..ceabab1473b1cbe53e10fed00760a33de2f948c0
--- /dev/null
+++ b/chrome/browser/usb/usb_chooser_context.h
@@ -0,0 +1,55 @@
+// 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_CONTEXT_H_
+#define CHROME_BROWSER_USB_USB_CHOOSER_CONTEXT_H_
+
+#include <map>
+#include <set>
+#include <string>
+
+#include "base/macros.h"
+#include "base/scoped_observer.h"
+#include "chrome/browser/permissions/chooser_context_base.h"
+#include "device/usb/usb_service.h"
+
+class UsbChooserContext : public ChooserContextBase,
+                          public device::UsbService::Observer {
+ public:
+  explicit UsbChooserContext(Profile* profile);
+  ~UsbChooserContext() override;
+
+  // Grants |requesting_origin| access to the USB device known to
+  // device::UsbService as |guid|.
+  void GrantDevicePermission(const GURL& requesting_origin,
+                             const GURL& embedding_origin,
+                             const std::string& guid);
+
+  // Revokes |requesting_origin|'s access to the USB device known to
+  // device::UsbService as |guid|.
+  void RevokeDevicePermission(const GURL& requesting_origin,
+                              const GURL& embedding_origin,
+                              const std::string& guid);
+
+  // Checks if |requesting_origin| (when embedded within |embedding_origin| has
+  // access to the USB device known to device::UsbService as |guid|.
+  bool HasDevicePermission(const GURL& requesting_origin,
+                           const GURL& embedding_origin,
+                           const std::string& guid);
+
+ private:
+  // ChooserContextBase implementation.
+  bool IsValidObject(const base::DictionaryValue& object) override;
+
+  // 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(UsbChooserContext);
+};
+
+#endif  // CHROME_BROWSER_USB_USB_CHOOSER_CONTEXT_H_