[SVGDom] Fix <ellipse> positioning

experimental/svg/model/SkSVGEllipse.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCanvas.h"
 #include "SkSVGEllipse.h"
 #include "SkSVGRenderContext.h"
@@ skipping 45 matching lines @@
 }
 
 void SkSVGEllipse::onDraw(SkCanvas* canvas, const SkSVGLengthContext& lctx,
                           const SkPaint& paint) const {
     const auto cx = lctx.resolve(fCx, SkSVGLengthContext::LengthType::kHorizontal);
     const auto cy = lctx.resolve(fCy, SkSVGLengthContext::LengthType::kVertical);
     const auto rx = lctx.resolve(fRx, SkSVGLengthContext::LengthType::kHorizontal);
     const auto ry = lctx.resolve(fRy, SkSVGLengthContext::LengthType::kVertical);
 
     if (rx > 0 && ry > 0) {
-        canvas->drawOval(SkRect::MakeXYWH(cx - rx / 2, cy - ry / 2, rx * 2, ry * 2), paint);
+        canvas->drawOval(SkRect::MakeXYWH(cx - rx, cy - ry, rx * 2, ry * 2), paint);
     }
 }