move all Config specific APIs into SkBitmapConfig.cpp -- Config is deprecated

src/images/SkDecodingImageGenerator.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkDecodingImageGenerator_DEFINED
 #define SkDecodingImageGenerator_DEFINED
 
@@ skipping 26 matching lines @@
      *         then the returned bitmap will be 1/3 as wide and high,
      *         and will contain 1/9 as many pixels as the original.
      *         Note: this is a hint, and the codec may choose to
      *         ignore this, or only approximate the sample size.
      *
      *  @param fDitherImage Set to true if the the decoder should try to
      *         dither the resulting image when decoding to a smaller
      *         color-space.  The default is true.
      *
      *  @param fRequestedColorType If not given, then use whichever
-     *         config the decoder wants.  Else try to use this color
+     *         colortype the decoder wants.  Else try to use this color
      *         type.  If the decoder won't support this color type,
      *         SkDecodingImageGenerator::Create will return
      *         NULL. kIndex_8_SkColorType is not supported.
      */
     struct Options {
         Options()
             : fSampleSize(1)
             , fDitherImage(true)
             , fUseRequestedColorType(false)
             , fRequestedColorType() { }
@@ skipping 48 matching lines @@
      *         SkImageGenerator constructor and and unref()ed on deletion.
      */
     static SkImageGenerator* Create(SkData* data, const Options& opt);
 
 private:
     SkData*                fData;
     SkStreamRewindable*    fStream;
     const SkImageInfo      fInfo;
     const int              fSampleSize;
     const bool             fDitherImage;
-    const SkBitmap::Config fRequestedConfig;
+    const SkColorType       fRequestedColorType;
+
     SkDecodingImageGenerator(SkData* data,
                              SkStreamRewindable* stream,
                              const SkImageInfo& info,
                              int sampleSize,
                              bool ditherImage,
-                             SkBitmap::Config requestedConfig);
+                             SkColorType requestedColorType);
     static SkImageGenerator* Create(SkData*, SkStreamRewindable*,
                                     const Options&);
     typedef SkImageGenerator INHERITED;
 };
 
 //  // Example of most basic use case:
 //
 //  bool install_data(SkData* data, SkBitmap* dst) {
 //     return SkInstallDiscardablePixelRef(
 //         SkDecodingImageGenerator::Create(
 //             data, SkDecodingImageGenerator::Options()), dst, NULL);
 //  }
 //  bool install_stream(SkStreamRewindable* stream, SkBitmap* dst) {
 //     return SkInstallDiscardablePixelRef(
 //         SkDecodingImageGenerator::Create(
 //             stream, SkDecodingImageGenerator::Options()), dst, NULL);
 //  }
 
 #endif  // SkDecodingImageGenerator_DEFINED