Connect WebUSB client interface to the devices app

device/devices_app/usb/device_manager_impl.cc

 // 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.
 
 #include "device/devices_app/usb/device_manager_impl.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/sequenced_task_runner.h"
@@ skipping 14 matching lines @@
 
 namespace {
 
 void OnGetDevicesOnServiceThread(
     const std::vector<UsbDeviceFilter>& filters,
     const base::Callback<void(mojo::Array<DeviceInfoPtr>)>& callback,
     scoped_refptr<base::TaskRunner> callback_task_runner,
     const std::vector<scoped_refptr<UsbDevice>>& devices) {
   mojo::Array<DeviceInfoPtr> mojo_devices(0);
   for (size_t i = 0; i < devices.size(); ++i) {
-    if (UsbDeviceFilter::MatchesAny(devices[i], filters))
+    if (UsbDeviceFilter::MatchesAny(devices[i], filters) || filters.empty())
       mojo_devices.push_back(DeviceInfo::From(*devices[i]));
   }
   callback_task_runner->PostTask(
       FROM_HERE, base::Bind(callback, base::Passed(&mojo_devices)));
 }
 
 void GetDevicesOnServiceThread(
     const std::vector<UsbDeviceFilter>& filters,
     const base::Callback<void(mojo::Array<DeviceInfoPtr>)>& callback,
     scoped_refptr<base::TaskRunner> callback_task_runner) {
@@ skipping 105 matching lines @@
   mojo::Array<DeviceInfoPtr> allowed_devices(0);
   for (size_t i = 0; i < devices.size(); ++i) {
     if (delegate_->IsDeviceAllowed(*devices[i]))
       allowed_devices.push_back(devices[i].Pass());
   }
   callback.Run(allowed_devices.Pass());
 }
 
 }  // namespace usb
 }  // namespace device