change pixel-serializer to support reencoding existing data

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 147 matching lines @@
         '<(skia_src_path)/core/SkPictureFlat.h',
         '<(skia_src_path)/core/SkPictureImageGenerator.cpp',
         '<(skia_src_path)/core/SkPicturePlayback.cpp',
         '<(skia_src_path)/core/SkPicturePlayback.h',
         '<(skia_src_path)/core/SkPictureRecord.cpp',
         '<(skia_src_path)/core/SkPictureRecord.h',
         '<(skia_src_path)/core/SkPictureRecorder.cpp',
         '<(skia_src_path)/core/SkPictureShader.cpp',
         '<(skia_src_path)/core/SkPictureShader.h',
         '<(skia_src_path)/core/SkPixelRef.cpp',
+        '<(skia_src_path)/core/SkPixelSerializer.cpp',
         '<(skia_src_path)/core/SkPixmap.cpp',
         '<(skia_src_path)/core/SkPoint.cpp',
         '<(skia_src_path)/core/SkPoint3.cpp',
         '<(skia_src_path)/core/SkPtrRecorder.cpp',
         '<(skia_src_path)/core/SkQuadClipper.cpp',
         '<(skia_src_path)/core/SkQuadClipper.h',
         '<(skia_src_path)/core/SkRasterClip.cpp',
         '<(skia_src_path)/core/SkRasterizer.cpp',
         '<(skia_src_path)/core/SkReadBuffer.h',
         '<(skia_src_path)/core/SkReadBuffer.cpp',
@@ skipping 223 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',
     ],
 }