add no-check version of SkPackARGB32, for callers that want to deliberately build a SkPMColor that may not be valid premultiplied (e.g. compatibility with webgl)
add no-check version of SkPackARGB32, for callers that want to deliberately
build a SkPMColor that may not be valid premultiplied (e.g. compatibility
with webgl)

see https://bugs.webkit.org/show_bug.cgi?id=54023



csulmone/skia,csulmone/skia,csulmone/skia,csulmone/skia