[SkSVGDevice] Initial shader/gradient support

experimental/svg/SkSVGDevice.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 SkSVGDevice_DEFINED
 #define SkSVGDevice_DEFINED
 
@@ skipping 44 matching lines @@
                               const SkPaint& paint) SK_OVERRIDE;
 
     virtual void drawDevice(const SkDraw&, SkBaseDevice*, int x, int y,
                             const SkPaint&) SK_OVERRIDE;
     virtual const SkBitmap& onAccessBitmap() SK_OVERRIDE;
 
 private:
     SkSVGDevice(const SkISize& size, SkWStream* wstream);
     virtual ~SkSVGDevice();
 
-    void addPaint(const SkPaint& paint);
-    void addTransform(const SkMatrix& t);
+    class AutoElement;
+    class ResourceBucket;
 
-    SkXMLWriter*  fWriter;
-    SkBitmap      fLegacyBitmap;
+    SkAutoTDelete<SkXMLWriter>    fWriter;
+    SkAutoTDelete<AutoElement>    fRootElement;
+    SkAutoTDelete<ResourceBucket> fResourceBucket;
+    SkBitmap                      fLegacyBitmap;
 };
 
 #endif // SkSVGDevice_DEFINED