Enhance GL error checking for non-Ganesh GL calls

https://codereview.appspot.com/7312057/



git-svn-id: http://skia.googlecode.com/svn/trunk@7647 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/bench/benchmain.cpp b/bench/benchmain.cpp
index 7b1a34e..2142da1 100644
--- a/bench/benchmain.cpp
+++ b/bench/benchmain.cpp
@@ -11,6 +11,7 @@
 
 #if SK_SUPPORT_GPU
 #include "GrContext.h"
+#include "gl/GrGLDefines.h"
 #include "GrRenderTarget.h"
 #if SK_ANGLE
 #include "gl/SkANGLEGLContext.h"