Show "Paired" for already paired WebUSB devices on the chooser

chrome/browser/usb/web_usb_permission_provider.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_PROVIDER_H_
 #define CHROME_BROWSER_USB_WEB_USB_PERMISSION_PROVIDER_H_
 
 #include <stdint.h>
 
 #include "base/memory/weak_ptr.h"
 #include "device/usb/mojo/permission_provider.h"
 
 namespace content {
 class RenderFrameHost;
 }
 
 // This implementation of the permission provider interface enforces the rules
 // of the WebUSB permission model. Devices are checked for WebUSB descriptors
 // granting access to the render frame's current origin as well as permission
 // granted by the user through a device chooser UI.
 class WebUSBPermissionProvider : public device::usb::PermissionProvider {
  public:
+  static bool HasDevicePermission(
+      content::RenderFrameHost* render_frame_host,
+      scoped_refptr<const device::UsbDevice> device);
+
   explicit WebUSBPermissionProvider(
       content::RenderFrameHost* render_frame_host);
   ~WebUSBPermissionProvider() override;
 
   base::WeakPtr<PermissionProvider> GetWeakPtr();
 
   // device::usb::PermissionProvider implementation.
   bool HasDevicePermission(
       scoped_refptr<const device::UsbDevice> device) const override;
   bool HasConfigurationPermission(
       uint8_t requested_configuration,
       scoped_refptr<const device::UsbDevice> device) const override;
   bool HasFunctionPermission(
       uint8_t requested_function,
       uint8_t configuration_value,
       scoped_refptr<const device::UsbDevice> device) const override;
   void IncrementConnectionCount() override;
   void DecrementConnectionCount() override;
 
  private:
   content::RenderFrameHost* const render_frame_host_;
   base::WeakPtrFactory<PermissionProvider> weak_factory_;
 };
 
 #endif  // CHROME_BROWSER_USB_WEB_USB_PERMISSION_PROVIDER_H_