Store USB device permissions in website settings.

chrome/browser/usb/usb_permission_context.h

Index: chrome/browser/usb/usb_permission_context.h
diff --git a/chrome/browser/usb/usb_permission_context.h b/chrome/browser/usb/usb_permission_context.h
new file mode 100644
index 0000000000000000000000000000000000000000..ed314aa7776599a2b5a72376a44147bd77133e15
--- /dev/null
+++ b/chrome/browser/usb/usb_permission_context.h
@@ -0,0 +1,21 @@
+// 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_PERMISSION_CONTEXT_H_
+#define CHROME_BROWSER_USB_USB_PERMISSION_CONTEXT_H_
+
+#include "chrome/browser/permissions/permission_context_base.h"
+
+class UsbPermissionContext : public PermissionContextBase {

[raymes, 2015/10/07 04:48:29]

Again, this would only be a permission that is queryable, not requestable, etc.
From my perspective that is completely ok and a good thing. The durable storage
permission has some similarities. We would want to make this clear in the code
though (e.g. RequestPermission should hit a NOTREACHED() or something). 

Mounir: what are your thoughts?

+ public:
+  explicit UsbPermissionContext(Profile* profile);
+  ~UsbPermissionContext() override;
+
+  bool IsRestrictedToSecureOrigins() const override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(UsbPermissionContext);
+};
+
+#endif  // CHROME_BROWSER_USB_USB_PERMISSION_CONTEXT_H_