Make GrClip.h private

BUG=skia:

Change-Id: I4aa3c2707811ece3a63d161035e316c3bbc1cd15
Reviewed-on: https://skia-review.googlesource.com/9482
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
diff --git a/tests/TessellatingPathRendererTests.cpp b/tests/TessellatingPathRendererTests.cpp
index 548be4b..8579c4d 100644
--- a/tests/TessellatingPathRendererTests.cpp
+++ b/tests/TessellatingPathRendererTests.cpp
@@ -10,9 +10,10 @@
 #include "SkPath.h"
 
 #if SK_SUPPORT_GPU
+#include "GrClip.h"
 #include "GrContext.h"
-#include "ops/GrTessellatingPathRenderer.h"
 #include "SkGradientShader.h"
+#include "ops/GrTessellatingPathRenderer.h"
 
 /*
  * These tests pass by not crashing, hanging or asserting in Debug.