Introducing chrome.usb.getDevices/openDevice API

chrome/common/extensions/permissions/usb_device_permission_data.h

 // Copyright (c) 2012 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_COMMON_EXTENSIONS_PERMISSIONS_USB_DEVICE_PERMISSION_DATA_H_
 #define CHROME_COMMON_EXTENSIONS_PERMISSIONS_USB_DEVICE_PERMISSION_DATA_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/common/extensions/permissions/api_permission.h"
 
 namespace base {
 
 class Value;
 
 }  // namespace base
 
 namespace extensions {
 
 // A pattern that can be used to match a USB device permission.
 // Should be of the format: vendorId:productId, where both vendorId and
 // productId are decimal strings representing uint16 values.
 class UsbDevicePermissionData {
  public:
   enum SpecialInterfaces {
     // A special interface id for stating permissions for an entire USB device,
     // no specific interface. This value must match value of Rule::ANY_INTERFACE
     // from ChromeOS permission_broker project.
-    ANY_INTERFACE = -1
+    ANY_INTERFACE = -1,
+
+    // A special interface id for |Check| to indicate that interface field is
+    // not to be checked. Not used in manifest file.
+    UNSPECIFIED_INTERFACE = -2
   };
 
   UsbDevicePermissionData();
   UsbDevicePermissionData(uint16 vendor_id,
                           uint16 product_id,
                           int interface_id);
 
   // Check if |param| (which must be a UsbDevicePermissionData::CheckParam)
   // matches the vendor and product IDs associated with |this|.
   bool Check(const APIPermission::CheckParam* param) const;
@@ skipping 17 matching lines @@
 
  private:
   uint16 vendor_id_;
   uint16 product_id_;
   int interface_id_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_COMMON_EXTENSIONS_PERMISSIONS_USB_DEVICE_PERMISSION_DATA_H_