NetPlay: Implement chunked data transfer

This sends arbitrary packets in chunks to be reassembled at the other
end, allowing large data transfers to be speed-limited and interleaved
with other packets being sent. It also enables tracking the progress of
large data transfers.

Source/Core/DolphinQt/NetPlay/ChunkedProgressDialog.h

@@ -0,0 +1,41 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include <QDialog>
+
+#include "Common/CommonTypes.h"
+
+class QGroupBox;
+class QLabel;
+class QProgressBar;
+class QVBoxLayout;
+class QWidget;
+
+class ChunkedProgressDialog : public QDialog
+{
+  Q_OBJECT
+public:
+  explicit ChunkedProgressDialog(QWidget* parent);
+
+  void show(const QString& title, u64 data_size, const std::vector<int>& players);
+  void SetProgress(int pid, u64 progress);
+
+private:
+  void CreateWidgets();
+  void ConnectWidgets();
+
+  std::map<int, QProgressBar*> m_progress_bars;
+  std::map<int, QLabel*> m_status_labels;
+  u64 m_data_size = 0;
+
+  QGroupBox* m_progress_box;
+  QVBoxLayout* m_progress_layout;
+  QVBoxLayout* m_main_layout;
+};