Permit MaterialDesignController to make IO call

ui/events/devices/device_util_linux.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 "ui/events/devices/device_util_linux.h"
 
 #include <string>
 
 #include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string_util.h"
+#include "base/threading/thread_restrictions.h"
 
 namespace ui {
 
 base::FilePath GetInputPathInSys(const base::FilePath& path) {
   return base::MakeAbsoluteFilePath(
       base::FilePath("/sys/class/input").Append(path.BaseName()));
 }
 
 InputDeviceType GetInputDeviceTypeFromPath(const base::FilePath& path) {
-  DCHECK(!base::MessageLoopForUI::IsCurrent());
+  base::ThreadRestrictions::AssertIOAllowed();
   std::string event_node = path.BaseName().value();
   if (event_node.empty() ||
       !base::StartsWith(event_node, "event",
                         base::CompareCase::INSENSITIVE_ASCII))
     return InputDeviceType::INPUT_DEVICE_UNKNOWN;
 
   base::FilePath sysfs_path = GetInputPathInSys(path);
 
   // Device does not exist.
   if (sysfs_path.empty())
@@ skipping 29 matching lines @@
     if (subsystem_path == "/sys/bus/usb")
       return InputDeviceType::INPUT_DEVICE_EXTERNAL;
     if (subsystem_path == "/sys/class/bluetooth")
       return InputDeviceType::INPUT_DEVICE_EXTERNAL;
   }
 
   return InputDeviceType::INPUT_DEVICE_UNKNOWN;
 }
 
 }  // namespace