Add SkSVGCanvas

include/svg/SkSVGCanvas.h

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkSVGCanvas_DEFINED
+#define SkSVGCanvas_DEFINED
+
+#include "SkCanvas.h"
+
+class SkXMLWriter;
+
+class SK_API SkSVGCanvas {
+public:
+    /**
+     *  Returns a new canvas that will generate SVG commands from its draw calls, and send
+     *  them to the provided xmlwriter. Ownership of the xmlwriter is not transfered to the canvas,
+     *  but it must stay valid during the lifetime of the returned canvas.
+     *
+     *  The canvas may buffer some drawing calls, so the output is not guaranteed to be valid
+     *  or complete until the canvas instance is deleted.
+     *
+     *  The 'bounds' parameter defines an initial SVG viewport (viewBox attribute on the root
+     *  SVG element).
+     */
+    static SkCanvas* Create(const SkRect& bounds, SkXMLWriter*);
+};
+
+#endif