[sksg] Initial Path support

TBR=

Change-Id: I594634d339b5e1ad9181dc5303af1a1c754d0fe3
Reviewed-on: https://skia-review.googlesource.com/89540
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>

BUILD.gn

@@ -1369,6 +1369,7 @@ if (skia_enable_tools) {
       "experimental/sksg/SkSGPaintNode.cpp",
       "experimental/sksg/SkSGRenderNode.cpp",
       "experimental/sksg/effects/SkSGTransform.cpp",
+      "experimental/sksg/geometry/SkSGPath.cpp",
       "experimental/sksg/geometry/SkSGRect.cpp",
       "experimental/sksg/paint/SkSGColor.cpp",
     ]

experimental/sksg/geometry/SkSGPath.cpp

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkSGPath.h"
+
+#include "SkCanvas.h"
+#include "SkPaint.h"
+
+namespace sksg {
+
+Path::Path(const SkPath& path) : fPath(path) {}
+
+void Path::onDraw(SkCanvas* canvas, const SkPaint& paint) const {
+    canvas->drawPath(fPath, paint);
+}
+
+SkRect Path::onComputeBounds() const {
+    return fPath.computeTightBounds();
+}
+
+} // namespace sksg

experimental/sksg/geometry/SkSGPath.h

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkSGPath_DEFINED
+#define SkSGPath_DEFINED
+
+#include "SkSGGeometryNode.h"
+
+#include "SkPath.h"
+
+class SkCanvas;
+class SkPaint;
+
+namespace sksg {
+
+/**
+ * Concrete Geometry node, wrapping an SkPath.
+ */
+class Path : public GeometryNode {
+public:
+    static sk_sp<Path> Make()                { return sk_sp<Path>(new Path(SkPath())); }
+    static sk_sp<Path> Make(const SkPath& r) { return sk_sp<Path>(new Path(r)); }
+
+    SG_ATTRIBUTE(Path, SkPath, fPath)
+
+protected:
+    void onDraw(SkCanvas*, const SkPaint&) const override;
+
+    SkRect onComputeBounds() const override;
+
+private:
+    explicit Path(const SkPath&);
+
+    SkPath fPath;
+};
+
+} // namespace sksg
+
+#endif // SkSGPath_DEFINED