Add onGetUsbPrinterInfoRequested event to printerProvider API.

chrome/browser/ui/webui/print_preview/extension_printer_handler.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_EXTENSION_PRINTER_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_EXTENSION_PRINTER_HANDLER_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 23 matching lines @@
 }
 
 namespace local_discovery {
 class PWGRasterConverter;
 }
 
 // Implementation of PrinterHandler interface backed by printerProvider
 // extension API.
 class ExtensionPrinterHandler : public PrinterHandler {
  public:
+  using GrantUsbPrinterAccessCallback =
+      base::Callback<void(const base::DictionaryValue& printer_info)>;
   using PrintJobCallback =
       base::Callback<void(scoped_ptr<extensions::PrinterProviderPrintJob>)>;
 
   ExtensionPrinterHandler(
       content::BrowserContext* browser_context,
       const scoped_refptr<base::TaskRunner>& slow_task_runner);
 
   ~ExtensionPrinterHandler() override;
 
   // PrinterHandler implementation:
   void Reset() override;
   void StartGetPrinters(
       const PrinterHandler::GetPrintersCallback& callback) override;
   void StartGetCapability(
       const std::string& destination_id,
       const PrinterHandler::GetCapabilityCallback& calback) override;
   // TODO(tbarzic): It might make sense to have the strings in a single struct.
   void StartPrint(const std::string& destination_id,
                   const std::string& capability,
                   const base::string16& job_title,
                   const std::string& ticket_json,
                   const gfx::Size& page_size,
                   const scoped_refptr<base::RefCountedMemory>& print_data,
                   const PrinterHandler::PrintCallback& callback) override;
 
+  void StartGrantUsbPrinterAccess(
+      const std::string& extension_id,
+      int device_id,
+      const GrantUsbPrinterAccessCallback& callback);
+
  private:
   friend class ExtensionPrinterHandlerTest;
 
   void SetPwgRasterConverterForTesting(
       scoped_ptr<local_discovery::PWGRasterConverter> pwg_raster_converter);
 
   // Converts |data| to PWG raster format (from PDF) for a printer described
   // by |printer_description|.
   // |callback| is called with the converted data.
   void ConvertToPWGRaster(
@@ skipping 16 matching lines @@
       const PrinterHandler::GetPrintersCallback& callback,
       const base::ListValue& pritners,
       bool done);
   void WrapGetCapabilityCallback(
       const PrinterHandler::GetCapabilityCallback& callback,
       const std::string& destination_id,
       const base::DictionaryValue& capability);
   void WrapPrintCallback(const PrinterHandler::PrintCallback& callback,
                          bool success,
                          const std::string& status);
+  void WrapGrantUsbPrinterAccessCallback(
+      const GrantUsbPrinterAccessCallback& callback,
+      const base::DictionaryValue& printer_info);
 
   content::BrowserContext* browser_context_;
 
   scoped_ptr<local_discovery::PWGRasterConverter> pwg_raster_converter_;
 
   scoped_refptr<base::TaskRunner> slow_task_runner_;
 
   base::WeakPtrFactory<ExtensionPrinterHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionPrinterHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_EXTENSION_PRINTER_HANDLER_H_