Add onGetUsbPrinterInfoRequested event to printerProvider API.

extensions/common/api/printer_provider_internal.idl

 // 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.
 
 // printerProviderInternal
 // Internal API used to run callbacks passed to chrome.printerProvider API
 // events.
 // When dispatching a chrome.printerProvider API event, its arguments will be
 // massaged in custom bindings so a callback is added. The callback uses
 // chrome.printerProviderInternal API to report the event results.
@@ skipping 21 matching lines @@
   callback BlobCallback = void(BlobInfo blobInfo);
 
   interface Functions {
     // Runs callback to printerProvider.onGetPrintersRequested event.
     // |requestId|: Parameter identifying the event instance for which the
     //     callback is run.
     // |printers|: List of printers reported by the extension.
     void reportPrinters(long requestId,
                         optional printerProvider.PrinterInfo[] printers);
 
+    // Runs callback to printerProvider.onUsbAccessGranted event.
+    // |requestId|: Parameter identifying the event instance for which the
+    //     callback is run.
+    // |printerInfo|: Printer information reported by the extension.
+    void reportUsbPrinterInfo(long requestId,
+                              optional printerProvider.PrinterInfo printerInfo);
+
     // Runs callback to printerProvider.onGetCapabilityRequested event.
     // |requestId|: Parameter identifying the event instance for which the
     //     callback is run.
     // |error|: The printer capability returned by the extension.
     void reportPrinterCapability(long request_id, optional object capability);
 
     // Runs callback to printerProvider.onPrintRequested event.
     // |requestId|: Parameter identifying the event instance for which the
     //     callback is run.
     // |error|: The requested print job result.
     void reportPrintResult(long request_id, optional PrintError error);
 
     // Gets information needed to create a print data blob for a print request.
     // The blob will be dispatched to the extension via
     // printerProvider.onPrintRequested event.
     // |requestId|: The request id for the print request for which data is
     //     needed.
     // |callback|: Callback called with the information needed to create a blob
     //     of print data.
     void getPrintData(long requestId, BlobCallback callback);
   };
 };