Add a service to track devices selected by the user.

device/usb/usb_device_impl.cc

 // 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.
 
 #include "device/usb/usb_device_impl.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/location.h"
@@ skipping 80 matching lines @@
     case LIBUSB_ISO_USAGE_TYPE_IMPLICIT:
       return USB_USAGE_EXPLICIT_FEEDBACK;
     default:
       NOTREACHED();
       return USB_USAGE_DATA;
   }
 }
 
 }  // namespace
 
+UsbDevice::UsbDevice(uint16 vendor_id, uint16 product_id, uint32 unique_id)
+    : vendor_id_(vendor_id), product_id_(product_id), unique_id_(unique_id) {
+}
+
+UsbDevice::~UsbDevice() {
+}
+
+void UsbDevice::NotifyDisconnect() {
+  FOR_EACH_OBSERVER(Observer, observer_list_, OnDisconnect(this));
+}
+
 UsbDeviceImpl::UsbDeviceImpl(
     scoped_refptr<UsbContext> context,
     scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
     PlatformUsbDevice platform_device,
     uint16 vendor_id,
     uint16 product_id,
     uint32 unique_id)
     : UsbDevice(vendor_id, product_id, unique_id),
       platform_device_(platform_device),
       current_configuration_cached_(false),
@@ skipping 155 matching lines @@
 
 void UsbDeviceImpl::OnDisconnect() {
   DCHECK(thread_checker_.CalledOnValidThread());
   HandlesVector handles;
   swap(handles, handles_);
   for (HandlesVector::iterator it = handles.begin(); it != handles.end(); ++it)
     (*it)->InternalClose();
 }
 
 }  // namespace device