Introducing chrome.usb.getDevices/openDevice API

chrome/browser/usb/usb_device.h

 // Copyright 2013 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_DEVICE_H_
 #define CHROME_BROWSER_USB_USB_DEVICE_H_
 
 #include <vector>
 
@@ skipping 10 matching lines @@
 
 // A UsbDevice object represents a detected USB device, providing basic
 // information about it. For further manipulation of the device, a
 // UsbDeviceHandle must be created from Open() method.
 class UsbDevice : public base::RefCountedThreadSafe<UsbDevice> {
  public:
   // Accessors to basic information.
   PlatformUsbDevice platform_device() const { return platform_device_; }
   uint16 vendor_id() const { return vendor_id_; }
   uint16 product_id() const { return product_id_; }
+  uint32 unique_id() const { return unique_id_; }
 
   // Creates a UsbDeviceHandle for further manipulation.
   // Blocking method. Must be called on FILE thread.
   virtual scoped_refptr<UsbDeviceHandle> Open();
 
   // Explicitly closes a device handle. This method will be automatically called
   // by the destructor of a UsbDeviceHandle as well.
   // Closing a closed handle is a safe
   // Blocking method. Must be called on FILE thread.
   virtual bool Close(scoped_refptr<UsbDeviceHandle> handle);
 
   // Lists the interfaces provided by the device and fills the given
   // UsbConfigDescriptor.
   // Blocking method. Must be called on FILE thread.
   virtual scoped_refptr<UsbConfigDescriptor> ListInterfaces();
 
  protected:
   friend class UsbService;
   friend class base::RefCountedThreadSafe<UsbDevice>;
 
   // Called by UsbService only;
   UsbDevice(scoped_refptr<UsbContext> context,
             PlatformUsbDevice platform_device,
             uint16 vendor_id,
-            uint16 product_id);
+            uint16 product_id,
+            uint32 unique_id);
 
   // Constructor called in test only.
   UsbDevice();
   virtual ~UsbDevice();
 
   // Called only be UsbService.
   virtual void OnDisconnect();
 
  private:
   PlatformUsbDevice platform_device_;
   uint16 vendor_id_;
   uint16 product_id_;
+  uint32 unique_id_;
 
   // Retain the context so that it will not be released before UsbDevice.
   scoped_refptr<UsbContext> context_;
 
   // Opened handles.
   typedef std::vector<scoped_refptr<UsbDeviceHandle> > HandlesVector;
   HandlesVector handles_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(UsbDevice);
 };
 
 #endif  // CHROME_BROWSER_USB_USB_DEVICE_H_