Updates to skimage tool to use it for testing.

gyp/images.gyp

 {
   'targets': [
     {
       'target_name': 'images',
       'product_name': 'skia_images',
       'type': 'static_library',
       'standalone_static_library': 1,
       'dependencies': [
         'libjpeg.gyp:*',
         'libwebp.gyp:libwebp',
         'utils.gyp:utils',
       ],
       'export_dependent_settings': [
         'libjpeg.gyp:*',
       ],
       'include_dirs': [
         '../include/config',
         '../include/core',
         '../include/images',
         '../include/lazy',
+        # for access to SkErrorInternals.h
+        '../src/core/',
         # for access to SkImagePriv.h
         '../src/image/',
       ],
       'sources': [
         '../include/images/SkImageDecoder.h',
         '../include/images/SkImageEncoder.h',
         '../include/images/SkImageRef.h',
         '../include/images/SkImageRef_GlobalPool.h',
         '../src/images/SkJpegUtility.h',
         '../include/images/SkMovie.h',
@@ skipping 125 matching lines @@
       },
     },
   ],
 }
 
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