Move functions from SkGr to SkGrPriv.h

Review URL: https://codereview.chromium.org/1397123002
diff --git a/src/utils/SkImageGeneratorUtils.cpp b/src/utils/SkImageGeneratorUtils.cpp
index c9b2252..42a0fe5 100644
--- a/src/utils/SkImageGeneratorUtils.cpp
+++ b/src/utils/SkImageGeneratorUtils.cpp
@@ -47,7 +47,7 @@
 
 #include "GrContext.h"
 #include "GrTexture.h"
-#include "SkGr.h"
+#include "SkGrPriv.h"
 
 class GeneratorFromTexture : public SkImageGenerator {
 public: