Remove GrRenderTargetContextPriv and GrSurfaceContextPriv

I think this is vestigial from some time in the past where RTC was
public.

Also just expose the methods that add ops rather than have so many
friends + testingOnly versions.

Change-Id: I60d9fdff23b2d67039a7b37815da7ff9e73d8999
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/339158
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/samplecode/SampleCCPRGeometry.cpp b/samplecode/SampleCCPRGeometry.cpp
index 191ebd4..6786ce0 100644
--- a/samplecode/SampleCCPRGeometry.cpp
+++ b/samplecode/SampleCCPRGeometry.cpp
@@ -22,7 +22,6 @@
 #include "src/gpu/GrOpFlushState.h"
 #include "src/gpu/GrRecordingContextPriv.h"
 #include "src/gpu/GrRenderTargetContext.h"
-#include "src/gpu/GrRenderTargetContextPriv.h"
 #include "src/gpu/GrResourceProvider.h"
 #include "src/gpu/ccpr/GrCCCoverageProcessor.h"
 #include "src/gpu/ccpr/GrCCFillGeometry.h"
@@ -206,7 +205,7 @@
                 ctx, GrColorType::kAlpha_F16, nullptr, SkBackingFit::kApprox, {width, height});
         SkASSERT(ccbuff);
         ccbuff->clear(SK_PMColor4fTRANSPARENT);
-        ccbuff->priv().testingOnly_addDrawOp(GrOp::Make<DrawCoverageCountOp>(ctx, this));
+        ccbuff->addDrawOp(GrOp::Make<DrawCoverageCountOp>(ctx, this));
 
         // Visualize coverage count in main canvas.
         GrPaint paint;