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

src/pdf/SkPDFDevice.cpp

Index: src/pdf/SkPDFDevice.cpp
diff --git a/src/pdf/SkPDFDevice.cpp b/src/pdf/SkPDFDevice.cpp
index edf17280ef7b4220ab2d0128e562825f9d8a76e2..73d41b1c36ac0e33bbf2a14259db5a230020f2fe 100644
--- a/src/pdf/SkPDFDevice.cpp
+++ b/src/pdf/SkPDFDevice.cpp
@@ -559,7 +559,8 @@ private:
 ////////////////////////////////////////////////////////////////////////////////
 
 SkPDFDevice::SkPDFDevice(SkISize pageSize, SkScalar rasterDpi, SkPDFDocument* doc, bool flip)
-    : INHERITED(SkSurfaceProps(0, kUnknown_SkPixelGeometry))
+    : INHERITED(SkImageInfo::MakeUnknown(pageSize.width(), pageSize.height()),
+                SkSurfaceProps(0, kUnknown_SkPixelGeometry))
     , fPageSize(pageSize)
     , fContentSize(pageSize)
     , fExistingClipRegion(SkIRect::MakeSize(pageSize))
@@ -1294,11 +1295,6 @@ void SkPDFDevice::drawDevice(const SkDraw& d, SkBaseDevice* device,
                                 &content.entry()->fContent);
 }
 
-SkImageInfo SkPDFDevice::imageInfo() const {
-    SkImageInfo info = SkImageInfo::MakeUnknown(fPageSize.width(), fPageSize.height());
-    return info;
-}
-
 sk_sp<SkSurface> SkPDFDevice::makeSurface(const SkImageInfo& info, const SkSurfaceProps& props) {
     return SkSurface::MakeRaster(info, &props);
 }