Track USB device configuration state in Blink.

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 <stddef.h>
 
 #include <algorithm>
 
@@ skipping 190 matching lines @@
   for (HandlesVector::iterator it = handles_.begin(); it != handles_.end();
        ++it) {
     if (it->get() == handle.get()) {
       (*it)->InternalClose();
       handles_.erase(it);
       return;
     }
   }
 }
 
-const UsbConfigDescriptor* UsbDeviceImpl::GetActiveConfiguration() {
+const UsbConfigDescriptor* UsbDeviceImpl::GetActiveConfiguration() const {
   DCHECK(thread_checker_.CalledOnValidThread());
   return active_configuration_;
 }
 
 void UsbDeviceImpl::OnDisconnect() {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   // Swap the list of handles into a local variable because closing all open
   // handles may release the last reference to this object.
   HandlesVector handles;
@@ skipping 107 matching lines @@
 void UsbDeviceImpl::Opened(PlatformUsbDeviceHandle platform_handle,
                            const OpenCallback& callback) {
   DCHECK(thread_checker_.CalledOnValidThread());
   scoped_refptr<UsbDeviceHandleImpl> device_handle = new UsbDeviceHandleImpl(
       context_, this, platform_handle, blocking_task_runner_);
   handles_.push_back(device_handle);
   callback.Run(device_handle);
 }
 
 }  // namespace device