Move Mutexy things to private.
There is no API change.
TBR=reed@google.com
BUG=skia:
Review URL: https://codereview.chromium.org/1368333004
diff --git a/include/gpu/GrResourceKey.h b/include/gpu/GrResourceKey.h
index 96e9988..6cfa90f 100644
--- a/include/gpu/GrResourceKey.h
+++ b/include/gpu/GrResourceKey.h
@@ -12,7 +12,7 @@
#include "../private/SkTemplates.h"
#include "GrTypes.h"
#include "SkData.h"
-#include "SkOnce.h"
+#include "../private/SkOnce.h"
uint32_t GrResourceKeyHash(const uint32_t* data, size_t size);