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

src/pdf/SkPDFDevice.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPDFDevice_DEFINED
 #define SkPDFDevice_DEFINED
 
@@ skipping 101 matching lines @@
                      const SkScalar pos[], int scalarsPerPos,
                      const SkPoint& offset, const SkPaint&) override;
     void drawVertices(const SkDraw&, SkCanvas::VertexMode,
                       int vertexCount, const SkPoint verts[],
                       const SkPoint texs[], const SkColor colors[],
                       SkXfermode* xmode, const uint16_t indices[],
                       int indexCount, const SkPaint& paint) override;
     void drawDevice(const SkDraw&, SkBaseDevice*, int x, int y,
                     const SkPaint&) override;
 
-    SkImageInfo imageInfo() const override;
-
     // PDF specific methods.
 
     /** Create the resource dictionary for this device. */
     sk_sp<SkPDFDict> makeResourceDict() const;
 
     /** Add our annotations (link to urls and destinations) to the supplied
      *  array.
      *  @param array Array to add annotations to.
      */
     void appendAnnotations(SkPDFArray* array) const;
@@ skipping 178 matching lines @@
 
     typedef SkBaseDevice INHERITED;
 
     // TODO(edisonn): Only SkDocument_PDF and SkPDFImageShader should be able to create
     // an SkPDFDevice
     //friend class SkDocument_PDF;
     //friend class SkPDFImageShader;
 };
 
 #endif