Debugger: Add initial GPU stats shell.

Core/Debugger/WebSocket/GPUStatsSubscriber.cpp

@@ -0,0 +1,24 @@
+// Copyright (c) 2021- PPSSPP Project.
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, version 2.0 or later versions.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License 2.0 for more details.
+
+// A copy of the GPL 2.0 should have been included with the program.
+// If not, see http://www.gnu.org/licenses/
+
+// Official git repository and contact information can be found at
+// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
+
+#include "Core/Debugger/WebSocket/GPUStatsSubscriber.h"
+#include "Core/HLE/sceDisplay.h"
+
+DebuggerSubscriber *WebSocketGPUStatsInit(DebuggerEventHandlerMap &map) {
+	// TODO
+	return nullptr;
+}