Fill incomplete images in SkCodec parent class

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 32 matching lines @@
 
     /*
      * Recommend a set of destination dimensions given a requested scale
      */
     SkISize onGetScaledDimensions(float desiredScale) const override;
 
     /*
      * Initiates the jpeg decode
      */
     Result onGetPixels(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes, const Options&,
-            SkPMColor*, int*) override;
+            SkPMColor*, int*, int*) override;
 
     SkEncodedFormat onGetEncodedFormat() const override {
         return kJPEG_SkEncodedFormat;
     }
 
     bool onRewind() override;
 
     bool onDimensionsSupported(const SkISize&) override;
 
 private:
@@ skipping 32 matching lines @@
     SkJpegCodec(const SkImageInfo& srcInfo, SkStream* stream, JpegDecoderMgr* decoderMgr);
 
     /*
      * 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);
 
     // scanline decoding
-    SkSampler* getSampler() override;
+    SkSampler* getSampler(bool createIfNecessary) override;
     Result onStartScanlineDecode(const SkImageInfo& dstInfo, const Options& options,
                    SkPMColor ctable[], int* ctableCount) override;
-    Result onGetScanlines(void* dst, int count, size_t rowBytes) override;
-    Result onSkipScanlines(int count) override;
+    int onGetScanlines(void* dst, int count, size_t rowBytes) override;
+    bool onSkipScanlines(int count) override;
 
     SkAutoTDelete<JpegDecoderMgr> fDecoderMgr;
     // We will save the state of the decompress struct after reading the header.
     // This allows us to safely call onGetScaledDimensions() at any time.
     const int                     fReadyState;
 
     // scanline decoding
     SkAutoMalloc               fStorage;    // Only used if sampling is needed
     uint8_t*                   fSrcRow;     // Only used if sampling is needed
     SkAutoTDelete<SkSwizzler>  fSwizzler;
     
     typedef SkCodec INHERITED;
 };
 
 #endif