Fix up -Winconsistent-missing-override

src/animator/SkXMLAnimatorWriter.h

 
 /*
  * Copyright 2006 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 SkXMLAnimatorWriter_DEFINED
 #define SkXMLAnimatorWriter_DEFINED
 
 #include "SkXMLWriter.h"
 
 class SkAnimator;
 class SkDisplayXMLParser;
 
 class SkXMLAnimatorWriter : public SkXMLWriter {
 public:
     SkXMLAnimatorWriter(SkAnimator*);
     virtual ~SkXMLAnimatorWriter();
-    virtual void    writeHeader();
+    void writeHeader() override;
     SkDEBUGCODE(static void UnitTest(class SkCanvas* canvas);)
 
 protected:
     void onAddAttributeLen(const char name[], const char value[], size_t length) override;
     void onEndElement() override;
     void onStartElementLen(const char elem[], size_t length) override;
     void onAddText(const char text[], size_t length) override;
 
 private:
     SkAnimator* fAnimator;
     SkDisplayXMLParser* fParser;
 };
 
 #endif // SkXMLAnimatorWriter_DEFINED