Revert of Delete SkImageDecoder

gyp/core.gypi

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 # Include this gypi to include all 'core' files
 # The parent gyp/gypi file must define
 #       'skia_src_path'     e.g. skia/trunk/src
 #       'skia_include_path' e.g. skia/trunk/include
 #
 # The skia build defines these in common_variables.gypi
@@ skipping 337 matching lines @@
         '<(skia_include_path)/core/SkDrawFilter.h',
         '<(skia_include_path)/core/SkDrawLooper.h',
         '<(skia_include_path)/core/SkError.h',
         '<(skia_include_path)/core/SkFixed.h',
         '<(skia_include_path)/core/SkFlattenable.h',
         '<(skia_include_path)/core/SkFlattenableSerialization.h',
         '<(skia_include_path)/core/SkFontHost.h',
         '<(skia_include_path)/core/SkFontStyle.h',
         '<(skia_include_path)/core/SkGraphics.h',
         '<(skia_include_path)/core/SkImage.h',
+        '<(skia_include_path)/core/SkImageDecoder.h',
         '<(skia_include_path)/core/SkImageEncoder.h',
         '<(skia_include_path)/core/SkImageFilter.h',
         '<(skia_include_path)/core/SkImageInfo.h',
         '<(skia_include_path)/core/SkMallocPixelRef.h',
         '<(skia_include_path)/core/SkMask.h',
         '<(skia_include_path)/core/SkMaskFilter.h',
         '<(skia_include_path)/core/SkMath.h',
         '<(skia_include_path)/core/SkMatrix.h',
         '<(skia_include_path)/core/SkMetaData.h',
         '<(skia_include_path)/core/SkMultiPictureDraw.h',
@@ skipping 110 matching lines @@
         '<(skia_src_path)/pathops/SkPathOpsLine.h',
         '<(skia_src_path)/pathops/SkPathOpsPoint.h',
         '<(skia_src_path)/pathops/SkPathOpsQuad.h',
         '<(skia_src_path)/pathops/SkPathOpsRect.h',
         '<(skia_src_path)/pathops/SkPathOpsTSect.h',
         '<(skia_src_path)/pathops/SkPathOpsTypes.h',
         '<(skia_src_path)/pathops/SkPathWriter.h',
         '<(skia_src_path)/pathops/SkReduceOrder.h',
     ],
 }