DolphinWX: Add USB passthrough settings

Allows adding/removing devices from USB passthrough.

Source/Core/DolphinWX/Config/AddUSBDeviceDiag.h

@@ -0,0 +1,56 @@
+// Copyright 2016 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <map>
+#include <utility>
+
+#include <wx/clntdata.h>
+#include <wx/dialog.h>
+#include <wx/timer.h>
+
+#include "Common/CommonTypes.h"
+
+class wxListBox;
+class wxSizer;
+class wxTextCtrl;
+
+class USBPassthroughDeviceEntry final : public wxClientData
+{
+public:
+  explicit USBPassthroughDeviceEntry(const std::pair<u16, u16> pair)
+      : m_vid(pair.first), m_pid(pair.second)
+  {
+  }
+  const u16 m_vid;
+  const u16 m_pid;
+};
+
+// This dialog is used to add a new USB device to the USB passthrough whitelist,
+// either by selecting a connected USB device or by entering the PID/VID manually.
+class AddUSBDeviceDiag final : public wxDialog
+{
+public:
+  explicit AddUSBDeviceDiag(wxWindow* parent);
+
+private:
+  static constexpr int DEVICE_REFRESH_INTERVAL_MS = 100;
+
+  void InitControls();
+  void RefreshDeviceList();
+  wxSizer* CreateManualControlsSizer();
+  wxSizer* CreateDeviceListSizer();
+
+  void OnRefreshDevicesTimer(wxTimerEvent&);
+  void OnDeviceSelection(wxCommandEvent&);
+  void OnSave(wxCommandEvent&);
+
+  std::map<std::pair<u16, u16>, std::string> m_shown_devices;
+  wxTimer m_refresh_devices_timer{this};
+
+  wxTextCtrl* m_new_device_vid_ctrl;
+  wxTextCtrl* m_new_device_pid_ctrl;
+  wxListBox* m_inserted_devices_listbox;
+};