Introducing chrome.usb.getDevices/openDevice API

chrome/common/extensions/permissions/usb_device_permission_data.h

Index: chrome/common/extensions/permissions/usb_device_permission_data.h
diff --git a/chrome/common/extensions/permissions/usb_device_permission_data.h b/chrome/common/extensions/permissions/usb_device_permission_data.h
index fa9b7337108f5fd49a658b516afb9f91b76fb2b8..30d86e8817591508b22f4212124abe77a851555a 100644
--- a/chrome/common/extensions/permissions/usb_device_permission_data.h
+++ b/chrome/common/extensions/permissions/usb_device_permission_data.h
@@ -27,7 +27,11 @@ class UsbDevicePermissionData {
     // 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();