Revert of Refactor drawContext/RenderTarget creation

src/effects/SkDisplacementMapEffect.cpp

Index: src/effects/SkDisplacementMapEffect.cpp
diff --git a/src/effects/SkDisplacementMapEffect.cpp b/src/effects/SkDisplacementMapEffect.cpp
index cf9e2c3c9f9a77531b4ea751f87797e008146df0..797bd972dd9850f979991127bf42cc2eb21392f0 100644
--- a/src/effects/SkDisplacementMapEffect.cpp
+++ b/src/effects/SkDisplacementMapEffect.cpp
@@ -317,6 +317,17 @@
             return nullptr;
         }
 
+        GrSurfaceDesc desc;
+        desc.fFlags = kRenderTarget_GrSurfaceFlag;
+        desc.fWidth = bounds.width();
+        desc.fHeight = bounds.height();
+        desc.fConfig = kSkia8888_GrPixelConfig;
+
+        sk_sp<GrTexture> dst(context->textureProvider()->createApproxTexture(desc));
+        if (!dst) {
+            return nullptr;
+        }
+
         GrPaint paint;
         SkMatrix offsetMatrix = GrCoordTransform::MakeDivByTextureWHMatrix(displTexture.get());
         offsetMatrix.preTranslate(SkIntToScalar(colorOffset.fX - displOffset.fX),
@@ -335,9 +346,7 @@
         SkMatrix matrix;
         matrix.setTranslate(-SkIntToScalar(colorBounds.x()), -SkIntToScalar(colorBounds.y()));
 
-        sk_sp<GrDrawContext> drawContext(context->newDrawContext(GrContext::kLoose_BackingFit,
-                                                                 bounds.width(), bounds.height(),
-                                                                 kSkia8888_GrPixelConfig));
+        sk_sp<GrDrawContext> drawContext(context->drawContext(sk_ref_sp(dst->asRenderTarget())));
         if (!drawContext) {
             return nullptr;
         }
@@ -348,7 +357,7 @@
         offset->fY = bounds.top();
         return SkSpecialImage::MakeFromGpu(SkIRect::MakeWH(bounds.width(), bounds.height()),
                                            kNeedNewImageUniqueID_SpecialImage,
-                                           drawContext->asTexture());
+                                           std::move(dst));
     }
 #endif