[gtk/tracing: 1330/1335] Add a way to start the profiler

[Matthias Clasen <matthiasc src gnome org>]

commit 83e049c98014a485df1b5cd678173773bfaa1df1
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat May 19 19:42:11 2018 +0100

    Add a way to start the profiler
    
    Start profiling if GDK_TRACE is set in the environment.

 gdk/gdk.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/gdk/gdk.c b/gdk/gdk.c
index 6954ef772e..de4bbd3dbf 100644
--- a/gdk/gdk.c
+++ b/gdk/gdk.c
@@ -26,6 +26,7 @@
 
 #include "gdkversionmacros.h"
 
+#include "gdkprofiler.h"
 #include "gdkinternals.h"
 #include "gdkintl.h"
 
@@ -216,6 +217,9 @@ gdk_pre_parse (void)
       _gdk_debug_flags = g_parse_debug_string (debug_string,
                                               (GDebugKey *) gdk_debug_keys,
                                               G_N_ELEMENTS (gdk_debug_keys));
+
+    if (g_getenv ("GDK_TRACE"))
+      gdk_profiler_start (-1);
   }
 #endif  /* G_ENABLE_DEBUG */