Implement basic USB device enumeration on Android.

device/usb/usb_device.h

 // Copyright 2014 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 DEVICE_USB_USB_DEVICE_H_
 #define DEVICE_USB_USB_DEVICE_H_
 
+#include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/strings/string16.h"
 #include "device/usb/usb_descriptors.h"
 #include "url/gurl.h"
 
 namespace device {
 
@@ skipping 31 matching lines @@
   }
 
   // On ChromeOS the permission_broker service is used to change the ownership
   // of USB device nodes so that Chrome can open them. On other platforms these
   // functions are no-ops and always return true.
   virtual void CheckUsbAccess(const ResultCallback& callback);
 
   // Creates a UsbDeviceHandle for further manipulation.
   virtual void Open(const OpenCallback& callback) = 0;
 
-  // Explicitly closes a device handle. This method will be automatically called
-  // by the destructor of a UsbDeviceHandle as well.
-  virtual bool Close(scoped_refptr<UsbDeviceHandle> handle) = 0;
-
   // Gets the UsbConfigDescriptor for the active device configuration or nullptr
   // if the device is unconfigured.
   virtual const UsbConfigDescriptor* GetActiveConfiguration() = 0;
 
  protected:
   UsbDevice(uint16_t vendor_id,
             uint16_t product_id,
             const base::string16& manufacturer_string,
             const base::string16& product_string,
             const base::string16& serial_number);
@@ skipping 17 matching lines @@
   const std::string guid_;
   const uint16_t vendor_id_;
   const uint16_t product_id_;
 
   DISALLOW_COPY_AND_ASSIGN(UsbDevice);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_USB_USB_DEVICE_H_