Move SkColorSpace ICC parsing/writing code to its own file

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2101823003

Review-Url: https://codereview.chromium.org/2101823003
diff --git a/gyp/core.gypi b/gyp/core.gypi
index 7c89960..91387a3 100644
--- a/gyp/core.gypi
+++ b/gyp/core.gypi
@@ -76,6 +76,7 @@
         '<(skia_src_path)/core/SkColorShader.cpp',
         '<(skia_src_path)/core/SkColorShader.h',
         '<(skia_src_path)/core/SkColorSpace.cpp',
+        '<(skia_src_path)/core/SkColorSpace_ICC.cpp',
         '<(skia_src_path)/core/SkColorSpaceXform.cpp',
         '<(skia_src_path)/core/SkColorTable.cpp',
         '<(skia_src_path)/core/SkComposeShader.cpp',