SkPDF: add `final` keyword to leaf classes

src/pdf/SkPDFTypes.h

 /*
  * Copyright 2010 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkPDFTypes_DEFINED
 #define SkPDFTypes_DEFINED
@@ skipping 150 matching lines @@
     SkPDFUnion(const SkPDFUnion&) = delete;
 };
 static_assert(sizeof(SkString) == sizeof(void*), "SkString_size");
 
 ////////////////////////////////////////////////////////////////////////////////
 
 #if 0  // Enable if needed.
 /** This class is a SkPDFUnion with SkPDFObject virtuals attached.
     The only use case of this is when a non-compound PDF object is
     referenced indirectly. */
-class SkPDFAtom : public SkPDFObject {
+class SkPDFAtom final : public SkPDFObject {
 public:
     void emitObject(SkWStream* stream,
                     const SkPDFObjNumMap& objNumMap,
                     const SkPDFSubstituteMap& substitutes) final;
     void addResources(SkPDFObjNumMap*, const SkPDFSubstituteMap&) const final;
     SkPDFAtom(SkPDFUnion&& v) : fValue(v.move()) {}
 
 private:
     const SkPDFUnion fValue;
     typedef SkPDFObject INHERITED;
 };
 #endif  // 0
 
 ////////////////////////////////////////////////////////////////////////////////
 
 /** \class SkPDFArray
 
     An array object in a PDF.
 */
-class SkPDFArray : public SkPDFObject {
+class SkPDFArray final : public SkPDFObject {
 public:
     static const int kMaxLen = 8191;
 
     /** Create a PDF array. Maximum length is 8191.
      */
     SkPDFArray();
     virtual ~SkPDFArray();
 
     // The SkPDFObject interface.
     void emitObject(SkWStream* stream,
@@ skipping 105 matching lines @@
     typedef SkPDFObject INHERITED;
 };
 
 /** \class SkPDFSharedStream
 
     This class takes an asset and assumes that it is backed by
     long-lived shared data (for example, an open file
     descriptor). That is: no memory savings can be made by holding on
     to a compressed version instead.
  */
-class SkPDFSharedStream : public SkPDFObject {
+class SkPDFSharedStream final : public SkPDFObject {
 public:
     // Takes ownership of asset.
     SkPDFSharedStream(SkStreamAsset* data) : fAsset(data), fDict(new SkPDFDict) { SkASSERT(data); }
     SkPDFDict* dict() { return fDict; }
     void emitObject(SkWStream*,
                     const SkPDFObjNumMap&,
                     const SkPDFSubstituteMap&) const override;
     void addResources(SkPDFObjNumMap*,
                       const SkPDFSubstituteMap&) const override;
 
@@ skipping 65 matching lines @@
 };
 
 #ifdef SK_PDF_IMAGE_STATS
 extern SkAtomic<int> gDrawImageCalls;
 extern SkAtomic<int> gJpegImageObjects;
 extern SkAtomic<int> gRegularImageObjects;
 extern void SkPDFImageDumpStats();
 #endif // SK_PDF_IMAGE_STATS
 
 #endif