store info in basedevice, change getter to non-virtual const&

src/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
 
 #include "SkDevice.h"
 #include "SkTemplates.h"
 
 class SkXMLWriter;
 
 class SkSVGDevice : public SkBaseDevice {
 public:
     static SkBaseDevice* Create(const SkISize& size, SkXMLWriter* writer);
 
-    SkImageInfo imageInfo() const override;
-
 protected:
     void drawPaint(const SkDraw&, const SkPaint& paint) override;
     void drawPoints(const SkDraw&, SkCanvas::PointMode mode, size_t count,
                     const SkPoint[], const SkPaint& paint) override;
     void drawRect(const SkDraw&, const SkRect& r, const SkPaint& paint) override;
     void drawOval(const SkDraw&, const SkRect& oval, const SkPaint& paint) override;
     void drawRRect(const SkDraw&, const SkRRect& rr, const SkPaint& paint) override;
     void drawPath(const SkDraw&, const SkPath& path,
                   const SkPaint& paint,
                   const SkMatrix* prePathMatrix = nullptr,
@@ skipping 29 matching lines @@
     virtual ~SkSVGDevice();
 
     void drawBitmapCommon(const SkDraw& draw, const SkBitmap& bm, const SkPaint& paint);
 
     class AutoElement;
     class ResourceBucket;
 
     SkXMLWriter*                  fWriter;
     SkAutoTDelete<AutoElement>    fRootElement;
     SkAutoTDelete<ResourceBucket> fResourceBucket;
-    SkISize                       fSize;
 
     typedef SkBaseDevice INHERITED;
 };
 
 #endif // SkSVGDevice_DEFINED