Consolidate SkCodec functions for handling rewind

src/codec/SkJpegCodec.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkJpegCodec_DEFINED
 #define SkJpegCodec_DEFINED
 
@@ skipping 47 matching lines @@
     /*
      * Initiates the jpeg decode
      */
     Result onGetPixels(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes, const Options&,
             SkPMColor*, int*) override;
 
     SkEncodedFormat onGetEncodedFormat() const override {
         return kJPEG_SkEncodedFormat;
     }
 
+    bool onRewind() override;
+
 private:
 
     /*
      * Read enough of the stream to initialize the SkJpegCodec.
      * Returns a bool representing success or failure.
      *
      * @param codecOut
      * If this returns true, and codecOut was not NULL,
      * codecOut will be set to a new SkJpegCodec.
      *
@@ skipping 16 matching lines @@
      * Called only by NewFromStream
      *
      * @param srcInfo contains the source width and height
      * @param stream the encoded image data
      * @param decoderMgr holds decompress struct, src manager, and error manager
      *                   takes ownership
      */
     SkJpegCodec(const SkImageInfo& srcInfo, SkStream* stream, JpegDecoderMgr* decoderMgr);
 
     /*
-     * Handles rewinding the input stream if it is necessary
-     */
-    bool handleRewind();
-
-    /*
      * Checks if the conversion between the input image and the requested output
      * image has been implemented
      * Sets the output color space
      */
     bool setOutputColorSpace(const SkImageInfo& dst);
 
     /*
      * Checks if we can scale to the requested dimensions and scales the dimensions
      * if possible
      */
     bool scaleToDimensions(uint32_t width, uint32_t height);
 
     /*
      * Create the swizzler based on the encoded format
      */
     void initializeSwizzler(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes,
             const Options& options);
 
     SkAutoTDelete<JpegDecoderMgr> fDecoderMgr;
 
     friend class SkJpegScanlineDecoder;
 
     typedef SkCodec INHERITED;
 };
 
 #endif