Added warning if GLX version is less than 1.3.

app/gfx/gl/gl_context_linux.cc

Index: app/gfx/gl/gl_context_linux.cc
===================================================================
--- app/gfx/gl/gl_context_linux.cc	(revision 48331)
+++ app/gfx/gl/gl_context_linux.cc	(working copy)
@@ -9,11 +9,13 @@
 #include <GL/glxew.h>
 #include <GL/glx.h>
 #include <GL/osmew.h>
+#include <unistd.h>
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
 
 #include "app/x11_util.h"
 #include "base/logging.h"
+#include "base/process_util.h"
 #include "base/scoped_ptr.h"
 #include "app/gfx/gl/gl_context.h"
 #include "app/gfx/gl/gl_context_osmesa.h"
@@ -149,6 +151,16 @@
       LOG(ERROR) << "glxewContextInit failed";
       return false;
     }
+
+    int major, minor;
+    if (!glXQueryVersion(display, &major, &minor)) {
+      LOG(ERROR) << "glxQueryVersion failed";
+      return false;
+    }
+
+    if (major == 1 && minor < 3) {
+      LOG(WARNING) << "GLX 1.3 or later is recommended.";
+    }
   }
 
   initialized = true;