Remove GrContextPriv.h from GrRenderTargetContext.h

Change-Id: Ib3afe6d8f2f9607eededb4dd4ef9dbe305741cfb
Reviewed-on: https://skia-review.googlesource.com/c/192829
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/ccpr/GrCCAtlas.cpp b/src/gpu/ccpr/GrCCAtlas.cpp
index 4d147fd..c297443 100644
--- a/src/gpu/ccpr/GrCCAtlas.cpp
+++ b/src/gpu/ccpr/GrCCAtlas.cpp
@@ -14,6 +14,7 @@
 #include "GrRenderTargetContext.h"
 #include "GrTexture.h"
 #include "GrTextureProxy.h"
+#include "SkIPoint16.h"
 #include "SkMakeUnique.h"
 #include "SkMathPriv.h"
 #include "ccpr/GrCCPathCache.h"