Add multiple selection support to chooser on desktops

chrome/browser/usb/usb_chooser_controller.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_USB_USB_CHOOSER_CONTROLLER_H_
 #define CHROME_BROWSER_USB_USB_CHOOSER_CONTROLLER_H_
 
 #include <unordered_map>
 #include <utility>
 #include <vector>
@@ skipping 29 matching lines @@
   ~UsbChooserController() override;
 
   // ChooserController:
   base::string16 GetNoOptionsText() const override;
   base::string16 GetOkButtonLabel() const override;
   size_t NumOptions() const override;
   base::string16 GetOption(size_t index) const override;
   bool IsPaired(size_t index) const override;
   void RefreshOptions() override;
   base::string16 GetStatus() const override;
-  void Select(size_t index) override;
+  void Select(const std::vector<size_t>& indices) override;
   void Cancel() override;
   void Close() override;
   void OpenHelpCenterUrl() const override;
 
   // device::UsbService::Observer:
   void OnDeviceAdded(scoped_refptr<device::UsbDevice> device) override;
   void OnDeviceRemoved(scoped_refptr<device::UsbDevice> device) override;
 
  private:
   void GotUsbDeviceList(
       const std::vector<scoped_refptr<device::UsbDevice>>& devices);
   bool DisplayDevice(scoped_refptr<device::UsbDevice> device) const;
 
   content::RenderFrameHost* const render_frame_host_;
   device::usb::ChooserService::GetPermissionCallback callback_;
   ScopedObserver<device::UsbService, device::UsbService::Observer>
       usb_service_observer_;
   std::vector<device::UsbDeviceFilter> filters_;
   // Each pair is a (device, device name).
   std::vector<std::pair<scoped_refptr<device::UsbDevice>, base::string16>>
       devices_;
   // Maps from device name to number of devices.
   std::unordered_map<base::string16, int> device_name_map_;
   base::WeakPtrFactory<UsbChooserController> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(UsbChooserController);
 };
 
 #endif  // CHROME_BROWSER_USB_USB_CHOOSER_CONTROLLER_H_