Add desired width & height to drawContext (as opposed to using the width & height of the RT)

src/core/SkSpecialSurface.cpp

Index: src/core/SkSpecialSurface.cpp
diff --git a/src/core/SkSpecialSurface.cpp b/src/core/SkSpecialSurface.cpp
index 510926a1f5db508b429ee55dc97ddface3629422..6f99462ef15113e7e7c94a0503f4dc5b459e0209 100644
--- a/src/core/SkSpecialSurface.cpp
+++ b/src/core/SkSpecialSurface.cpp
@@ -115,13 +115,11 @@ sk_sp<SkSpecialSurface> SkSpecialSurface::MakeRaster(const SkImageInfo& info,
 
 class SkSpecialSurface_Gpu : public SkSpecialSurface_Base {
 public:
-    SkSpecialSurface_Gpu(sk_sp<GrDrawContext> drawContext,
-                         int width, int height,
-                         const SkIRect& subset)
+    SkSpecialSurface_Gpu(sk_sp<GrDrawContext> drawContext, const SkIRect& subset)
         : INHERITED(subset, &drawContext->surfaceProps())
         , fDrawContext(std::move(drawContext)) {
 
-        sk_sp<SkBaseDevice> device(SkGpuDevice::Make(fDrawContext, width, height,
+        sk_sp<SkBaseDevice> device(SkGpuDevice::Make(fDrawContext,
                                                      SkGpuDevice::kUninit_InitContents));
         if (!device) {
             return;
@@ -166,7 +164,7 @@ sk_sp<SkSpecialSurface> SkSpecialSurface::MakeRenderTarget(GrContext* context,
 
     const SkIRect subset = SkIRect::MakeWH(width, height);
 
-    return sk_make_sp<SkSpecialSurface_Gpu>(std::move(drawContext), width, height, subset);
+    return sk_make_sp<SkSpecialSurface_Gpu>(std::move(drawContext), subset);
 }
 
 #endif