Bring sk_sp to GrDrawContext

This is split out of: https://codereview.chromium.org/1914883002/ (Refactor drawContext/RenderTarget creation)

GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1918003003

Review-Url: https://codereview.chromium.org/1918003003
diff --git a/src/gpu/GrPathRenderingDrawContext.h b/src/gpu/GrPathRenderingDrawContext.h
index 49a0e1d..5d1893c 100644
--- a/src/gpu/GrPathRenderingDrawContext.h
+++ b/src/gpu/GrPathRenderingDrawContext.h
@@ -26,10 +26,10 @@
                       SkScalar x, SkScalar y,
                       SkDrawFilter*, const SkIRect& clipBounds) override;
 protected:
-    GrPathRenderingDrawContext(GrContext* ctx, GrDrawingManager* mgr, GrRenderTarget* rt,
+    GrPathRenderingDrawContext(GrContext* ctx, GrDrawingManager* mgr, sk_sp<GrRenderTarget> rt,
                                const SkSurfaceProps* surfaceProps, GrAuditTrail* at,
                                GrSingleOwner* so)
-        : INHERITED(ctx, mgr, rt, surfaceProps, at, so) {}
+        : INHERITED(ctx, mgr, std::move(rt), surfaceProps, at, so) {}
 
 private:
     SkAutoTDelete<GrStencilAndCoverTextContext> fStencilAndCoverTextContext;