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

src/svg/SkSVGDevice.cpp

Index: src/svg/SkSVGDevice.cpp
diff --git a/src/svg/SkSVGDevice.cpp b/src/svg/SkSVGDevice.cpp
index 4330901b7e859c489104f19b072a59503009df22..3ba721ee3902ae4621ee77329f7b91d6111aacf7 100644
--- a/src/svg/SkSVGDevice.cpp
+++ b/src/svg/SkSVGDevice.cpp
@@ -570,10 +570,11 @@ SkBaseDevice* SkSVGDevice::Create(const SkISize& size, SkXMLWriter* writer) {
 }
 
 SkSVGDevice::SkSVGDevice(const SkISize& size, SkXMLWriter* writer)
-    : INHERITED(SkSurfaceProps(0, kUnknown_SkPixelGeometry))
+    : INHERITED(SkImageInfo::MakeUnknown(size.fWidth, size.fHeight),
+                SkSurfaceProps(0, kUnknown_SkPixelGeometry))
     , fWriter(writer)
     , fResourceBucket(new ResourceBucket)
-    , fSize(size) {
+{
     SkASSERT(writer);
 
     fWriter->writeHeader();
@@ -590,11 +591,6 @@ SkSVGDevice::SkSVGDevice(const SkISize& size, SkXMLWriter* writer)
 SkSVGDevice::~SkSVGDevice() {
 }
 
-SkImageInfo SkSVGDevice::imageInfo() const {
-    SkImageInfo info = SkImageInfo::MakeUnknown(fSize.fWidth, fSize.fHeight);
-    return info;
-}
-
 void SkSVGDevice::drawPaint(const SkDraw& draw, const SkPaint& paint) {
     AutoElement rect("rect", fWriter, fResourceBucket, draw, paint);
     rect.addRectAttributes(SkRect::MakeWH(SkIntToScalar(this->width()),