Revert "Revert[2] "clean up (partially) colortable api"""

Revert "Revert[2] "clean up (partially) colortable api"""

This reverts commit 9920b10f5292838f00600f676c4578cd11705e60.

Reason for revert: trying to get details on w2k failure

https://chromium-swarm.appspot.com/task?id=354345d34ba3b310&refresh=10

Caught exception 3221225477 EXCEPTION_ACCESS_VIOLATION, was running:
	unit test  HugeBlurImageFilter
	unit test  FontNames
	unit test  Codec_PngRoundTrip
	unit test  ClampRange
	unit test  FontHost
	unit test  ColorMatrixFilter
	f16 image scaled_codec_premul abnormal.wbmp
	565 image brd_android_codec_divisor_0.167 interlaced3.png_0.167
	unit test  Codec_png
	unit test  ImageFilterBlurLargeImage
	unit test  FontObj
	unit test  DrawText
	unit test  GrShape
	565 image brd_android_codec_divisor_0.333 interlaced2.png_0.333
	unit test  PathOpsOpCubicsThreaded
	unit test  PathOpsOpLoopsThreaded
	unit test  FontMgr
	unit test  ColorToHSVRoundTrip
	unit test  Image_Serialize_Encoding_Failure
Likely culprit:
	unit test  Image_Serialize_Encoding_Failure
step returned non-zero exit code: -1073741819

Original change's description:
> Revert[2] "clean up (partially) colortable api""
>
> This reverts commit 1d1165ca6575e082b892c5460492c411618783ad.
>
> Bug: skia:
> Change-Id: Idbc0634ae3cec2e79f592d252de8751b077e6408
> Reviewed-on: https://skia-review.googlesource.com/11024
> Reviewed-by: Mike Reed <reed@google.com>
> Commit-Queue: Mike Reed <reed@google.com>
>

TBR=reed@google.com,reviews@skia.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: Ia4e73434b083224baa36092c69526c2f59bb16aa
Reviewed-on: https://skia-review.googlesource.com/11025
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>