Bring sk_sp to GrDrawContext

src/effects/SkAlphaThresholdFilter.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkAlphaThresholdFilter.h"
 
 #include "SkBitmap.h"
@@ skipping 93 matching lines @@
     maskDesc.fFlags = kRenderTarget_GrSurfaceFlag;
     // Add one pixel of border to ensure that clamp mode will be all zeros
     // the outside.
     maskDesc.fWidth = bounds.width();
     maskDesc.fHeight = bounds.height();
     sk_sp<GrTexture> maskTexture(context->textureProvider()->createApproxTexture(maskDesc));
     if (!maskTexture) {
         return nullptr;
     }
 
-    sk_sp<GrDrawContext> drawContext(context->drawContext(maskTexture->asRenderTarget()));
+    sk_sp<GrDrawContext> drawContext(
+                                context->drawContext(sk_ref_sp(maskTexture->asRenderTarget())));
     if (!drawContext) {
         return nullptr;
     }
 
     GrPaint grPaint;
     grPaint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
     SkRegion::Iterator iter(fRegion);
     drawContext->clear(nullptr, 0x0, true);
 
     GrClip clip(SkRect::Make(SkIRect::MakeWH(bounds.width(), bounds.height())));
@@ skipping 141 matching lines @@
                                           dst);
 }
 
 #ifndef SK_IGNORE_TO_STRING
 void SkAlphaThresholdFilterImpl::toString(SkString* str) const {
     str->appendf("SkAlphaThresholdImageFilter: (");
     str->appendf("inner: %f outer: %f", fInnerThreshold, fOuterThreshold);
     str->append(")");
 }
 #endif