Add FrameTiming.cpp/h (with no real contents)

Core/FrameTiming.cpp

@@ -0,0 +1,12 @@
+#include "Common/Profiler/Profiler.h"
+#include "Common/Log.h"
+#include "Common/TimeUtil.h"
+
+#include "Core/RetroAchievements.h"
+#include "Core/CoreParameter.h"
+#include "Core/Core.h"
+#include "Core/Config.h"
+#include "Core/HW/Display.h"
+#include "Core/FrameTiming.h"
+
+FrameTiming g_frameTiming;