SkPDF: draw{Image,Bitmap} always serializes early

src/pdf/SkPDFDocument.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkPDFDocument_DEFINED
 #define SkPDFDocument_DEFINED
 
 #include "SkDocument.h"
@@ skipping 13 matching lines @@
 // keep similar functionality together.
 struct SkPDFObjectSerializer : SkNoncopyable {
     SkPDFObjNumMap fObjNumMap;
     SkPDFSubstituteMap fSubstituteMap;
     SkTDArray<int32_t> fOffsets;
     sk_sp<SkPDFObject> fInfoDict;
     size_t fBaseOffset;
     int32_t fNextToBeSerialized;  // index in fObjNumMap
 
     SkPDFObjectSerializer();
+    ~SkPDFObjectSerializer();
     void addObjectRecursively(const sk_sp<SkPDFObject>&);
     void serializeHeader(SkWStream*, const SkPDFMetadata&);
     void serializeObjects(SkWStream*);
     void serializeFooter(SkWStream*, const sk_sp<SkPDFObject>, sk_sp<SkPDFObject>);
     int32_t offset(SkWStream*);
 };
 
 /** Concrete implementation of SkDocument that creates PDF files. This
     class does not produced linearized or optimized PDFs; instead it
     it attempts to use a minimum amount of RAM. */
@@ skipping 32 matching lines @@
     SkPDFGlyphSetMap fGlyphUsage;
     SkTArray<sk_sp<SkPDFDict>> fPages;
     sk_sp<SkPDFDict> fDests;
     sk_sp<SkPDFDevice> fPageDevice;
     sk_sp<SkCanvas> fCanvas;
     SkScalar fRasterDpi;
     SkPDFMetadata fMetadata;
 };
 
 #endif  // SkPDFDocument_DEFINED