Call standard libjpeg/libjpeg-turbo APIs from SkJpegCodec

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 98 matching lines @@
      */
     bool setOutputColorSpace(const SkImageInfo& dst);
 
     /*
      * Checks if we can natively scale to the requested dimensions and natively scales the 
      * dimensions if possible
      */
     bool nativelyScaleToDimensions(uint32_t width, uint32_t height); 
 
     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;
     
     friend class SkJpegScanlineDecoder;
 
     typedef SkCodec INHERITED;
 };
 
 #endif