diff --git a/public/engine/thinktracecounter.h b/public/engine/thinktracecounter.h
new file mode 100644
index 00000000..7aee06b1
--- /dev/null
+++ b/public/engine/thinktracecounter.h
@@ -0,0 +1,49 @@
+//========= Copyright 1996-2005, Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Some macros for the raytraces-in-think-function-counter. 
+//          They're in a header because they're included in a bunch of 
+//          places, but on some cases they need to define files and in 
+//          others only extern them. 
+//
+//=============================================================================//
+
+#ifndef THINK_TRACE_COUNTER_H
+#define THINK_TRACE_COUNTER_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#define THINK_TRACE_COUNTER_COMPILED 1 // without this, all the code is elided.
+
+
+#ifdef THINK_TRACE_COUNTER_COMPILED
+	// create a macro that is true if we are allowed to debug traces during thinks, and compiles out to nothing otherwise.
+	#if defined( _GAMECONSOLE ) || defined( NO_STEAM )
+		#define DEBUG_THINK_TRACE_COUNTER_ALLOWED()  (!IsCert())
+	#else
+		#ifdef THINK_TRACE_COUNTER_COMPILE_FUNCTIONS_ENGINE
+			bool DEBUG_THINK_TRACE_COUNTER_ALLOWED()
+			{
+				// done as a static var to defer initialization until Steam is ready,
+				// but also to have the fastest check at runtime (rather than calling through
+				// the API each time)
+				static bool bIsPublic = GetSteamUniverse() == k_EUniversePublic;
+				return !bIsPublic;
+			}
+		#elif defined( THINK_TRACE_COUNTER_COMPILE_FUNCTIONS_SERVER )
+			bool DEBUG_THINK_TRACE_COUNTER_ALLOWED()
+			{
+				// done as a static var to defer initialization until Steam is ready,
+				// but also to have the fastest check at runtime (rather than calling through
+				// the API each time)
+				static bool bIsPublic = steamapicontext->SteamUtils() != NULL && steamapicontext->SteamUtils()->GetConnectedUniverse() == k_EUniversePublic;
+				return !bIsPublic;
+			}
+		#else
+			extern bool DEBUG_THINK_TRACE_COUNTER_ALLOWED();
+		#endif
+	#endif
+#endif
+
+
+#endif // THINK_TRACE_COUNTER_H