Block some HID devices from chrome.hid.

chrome/browser/extensions/api/hid/hid_device_manager.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 CHROME_BROWSER_EXTENSIONS_API_HID_HID_DEVICE_MANAGER_H_
 #define CHROME_BROWSER_EXTENSIONS_API_HID_HID_DEVICE_MANAGER_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 26 matching lines @@
 
   bool GetDeviceInfo(int resource_id, device::HidDeviceInfo* device_info);
 
  private:
   friend class BrowserContextKeyedAPIFactory<HidDeviceManager>;
 
   static const char* service_name() { return "HidDeviceManager"; }
 
   void UpdateDevices();
 
+  // Determines if a given device interface should be accessible to API
+  // consumers. In order for a device interface to be accessible, ALL of its
+  // specified usages must be accessible.
+  static bool IsDeviceAccessible(const device::HidDeviceInfo& device_info);
+
+  // Determines if a given usage is available to API consumers. This is used to
+  // blacklist usages which could be security or privacy concerns.
+  static bool IsUsageAccessible(const device::HidUsageAndPage& usage_and_page);
+
   base::ThreadChecker thread_checker_;
 
   int next_resource_id_;
 
   typedef std::map<int, device::HidDeviceId> ResourceIdToDeviceIdMap;
   typedef std::map<device::HidDeviceId, int> DeviceIdToResourceIdMap;
 
   ResourceIdToDeviceIdMap device_ids_;
   DeviceIdToResourceIdMap resource_ids_;
 
   DISALLOW_COPY_AND_ASSIGN(HidDeviceManager);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_HID_HID_DEVICE_MANAGER_H_