SkPDF: add `final` keyword to leaf classes

src/pdf/SkPDFShader.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 SkPDFShader_DEFINED
@@ skipping 32 matching lines @@
      *                     rasterization.
      */
     static SkPDFObject* GetPDFShader(SkPDFCanon* canon,
                                      SkScalar dpi,
                                      const SkShader& shader,
                                      const SkMatrix& matrix,
                                      const SkIRect& surfaceBBox,
                                      SkScalar rasterScale);
 };
 
-class SkPDFFunctionShader : public SkPDFDict {
+class SkPDFFunctionShader final : public SkPDFDict {
     
 
 public:
     static SkPDFFunctionShader* Create(SkPDFCanon*,
                                        SkAutoTDelete<SkPDFShader::State>*);
     virtual ~SkPDFFunctionShader();
     bool equals(const SkPDFShader::State&) const;
 
 private:
     SkAutoTDelete<const SkPDFShader::State> fShaderState;
     SkPDFFunctionShader(SkPDFShader::State*);
     typedef SkPDFDict INHERITED;
 };
 
 /**
  * A shader for PDF gradients. This encapsulates the function shader
  * inside a tiling pattern while providing a common pattern interface.
  * The encapsulation allows the use of a SMask for transparency gradients.
  */
-class SkPDFAlphaFunctionShader : public SkPDFStream {
+class SkPDFAlphaFunctionShader final : public SkPDFStream {
 public:
     static SkPDFAlphaFunctionShader* Create(SkPDFCanon*,
                                             SkScalar dpi,
                                             SkAutoTDelete<SkPDFShader::State>*);
     virtual ~SkPDFAlphaFunctionShader();
     bool equals(const SkPDFShader::State&) const;
 
 private:
     SkAutoTDelete<const SkPDFShader::State> fShaderState;
     SkPDFAlphaFunctionShader(SkPDFShader::State*);
     typedef SkPDFStream INHERITED;
 };
 
-class SkPDFImageShader : public SkPDFStream {
+class SkPDFImageShader final : public SkPDFStream {
 public:
     static SkPDFImageShader* Create(SkPDFCanon*,
                                     SkScalar dpi,
                                     SkAutoTDelete<SkPDFShader::State>*);
     virtual ~SkPDFImageShader();
     bool equals(const SkPDFShader::State&) const;
 
 private:
     SkAutoTDelete<const SkPDFShader::State> fShaderState;
     SkPDFImageShader(SkPDFShader::State*);
     typedef SkPDFStream INHERITED;
 };
 
 #endif