Add utils to better quantize grayscale values to three bit indices while

gyp/utils.gypi

 # Include this gypi to include all 'utils' 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
 #
 {
     'sources': [
         # Classes for a threadpool.
@@ skipping 71 matching lines @@
         '<(skia_src_path)/utils/SkPatchGrid.h',
         '<(skia_src_path)/utils/SkPatchUtils.cpp',
         '<(skia_src_path)/utils/SkPatchUtils.h',
         '<(skia_src_path)/utils/SkPathUtils.cpp',
         '<(skia_src_path)/utils/SkProxyCanvas.cpp',
         '<(skia_src_path)/utils/SkSHA1.cpp',
         '<(skia_src_path)/utils/SkSHA1.h',
         '<(skia_src_path)/utils/SkRTConf.cpp',
         '<(skia_src_path)/utils/SkTextureCompressor.cpp',
         '<(skia_src_path)/utils/SkTextureCompressor.h',
+        '<(skia_src_path)/utils/SkTextureCompressor_Utils.h',
         '<(skia_src_path)/utils/SkTextureCompressor_ASTC.cpp',
         '<(skia_src_path)/utils/SkTextureCompressor_ASTC.h',
         '<(skia_src_path)/utils/SkTextureCompressor_Blitter.h',
         '<(skia_src_path)/utils/SkTextureCompressor_R11EAC.cpp',
         '<(skia_src_path)/utils/SkTextureCompressor_R11EAC.h',
         '<(skia_src_path)/utils/SkTextureCompressor_LATC.cpp',
         '<(skia_src_path)/utils/SkTextureCompressor_LATC.h',
         '<(skia_src_path)/utils/SkThreadUtils.h',
         '<(skia_src_path)/utils/SkThreadUtils_pthread.cpp',
         '<(skia_src_path)/utils/SkThreadUtils_pthread.h',
@@ skipping 25 matching lines @@
         '<(skia_src_path)/utils/win/SkIStream.cpp',
         '<(skia_src_path)/utils/win/SkWGL_win.cpp',
 
         #testing
         '<(skia_src_path)/fonts/SkGScalerContext.cpp',
         '<(skia_src_path)/fonts/SkGScalerContext.h',
         '<(skia_src_path)/fonts/SkTestScalerContext.cpp',
         '<(skia_src_path)/fonts/SkTestScalerContext.h',
     ],
 }