Read HID report descriptor from sysfs and request permission on connect.

device/hid/hid_service.h

 // Copyright 2014 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 DEVICE_HID_HID_SERVICE_H_
 #define DEVICE_HID_HID_SERVICE_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 13 matching lines @@
       scoped_refptr<base::SingleThreadTaskRunner> file_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner);
 
   // Enumerates and returns a list of device identifiers.
   virtual void GetDevices(std::vector<HidDeviceInfo>* devices);
 
   // Fills in a DeviceInfo struct with info for the given device_id.
   // Returns |true| if successful or |false| if |device_id| is invalid.
   bool GetDeviceInfo(const HidDeviceId& device_id, HidDeviceInfo* info) const;
 
+#if defined(OS_CHROMEOS)
+  // Requests access to the given device from the Chrome OS permission broker.
+  virtual void RequestAccess(
+      const HidDeviceId& device_id,
+      const base::Callback<void(bool success)>& callback) = 0;
+#endif
+
   virtual scoped_refptr<HidConnection> Connect(
       const HidDeviceId& device_id) = 0;
 
  protected:
   friend class HidConnectionTest;
 
   typedef std::map<HidDeviceId, HidDeviceInfo> DeviceMap;
 
   HidService();
   virtual ~HidService();
 
   void AddDevice(const HidDeviceInfo& info);
   void RemoveDevice(const HidDeviceId& device_id);
 
   const DeviceMap& devices() const { return devices_; }
 
   base::ThreadChecker thread_checker_;
 
  private:
   class Destroyer;
 
   DeviceMap devices_;
 
   DISALLOW_COPY_AND_ASSIGN(HidService);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_HID_HID_SERVICE_H_