Uploaded https://chromium-review.googlesource.com/c/chromium/src/+/729602 to use a dict file for ICC profiles.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/dda204753ddbe089e2abfc839ed3bff88dfef577

commit dda204753ddbe089e2abfc839ed3bff88dfef577
Author: Noel Gordon <noel@chromium.org>
Date: Fri Oct 20 04:58:55 2017

color_transform_fuzzer: Add a fuzzer dict

Add ICC profile fuzzer dictionary. Also increase the maximum profile
size to 4M to match our other color space fuzzers [1].

[1] https://cs.chromium.org/search/?q=qcms_color_space_fuzzer
    https://cs.chromium.org/search/?q=skia_color_space_fuzzer

Bug:  776604 
Change-Id: Ifd8ad31633d003d357fc536045cd696f10ec81d6
Reviewed-on: https://chromium-review.googlesource.com/729602
Commit-Queue: Noel Gordon <noel@chromium.org>
Reviewed-by: Max Moroz <mmoroz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#510344}
[modify] https://crrev.com/dda204753ddbe089e2abfc839ed3bff88dfef577/ui/gfx/BUILD.gn

Uploaded https://chromium-review.googlesource.com/c/chromium/src/+/730033 to increase color_transform_fuzzer transform coverage.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/679aa7511d9a69e3cfe32e111ed75dc007c9970a

commit 679aa7511d9a69e3cfe32e111ed75dc007c9970a
Author: Noel Gordon <noel@chromium.org>
Date: Mon Oct 23 00:19:32 2017

Increase color_transform_fuzzer transform coverage

- increase the input size to 4M to match other color fuzzers
- add a struct Environment to remove logging from the fuzzer
- create a test profile from the data; bail if it's invalid
- use the fuzz hash to choose the "other" color profile
- use the test and "other" profile as either a color transform
  input or output color space, based on the fuzz hash
- apply the color transform to a random buffer of pixels

Tbr: hubbe@chromium.org
Bug:  776604 
Change-Id: I6b5163ef6bf735d9023d805b923bd58c30ba2472
Reviewed-on: https://chromium-review.googlesource.com/730033
Commit-Queue: Noel Gordon <noel@chromium.org>
Reviewed-by: Max Moroz <mmoroz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#510716}
[modify] https://crrev.com/679aa7511d9a69e3cfe32e111ed75dc007c9970a/ui/gfx/color_transform_fuzzer.cc

Final step is to add seed color profiles to the GCE corpus.  I have about 1500 color profiles and will upload those ...

Actually, 3221 seed color profiles but who's counting.

Uploaded seeds to libfuzzer/color_transform_fuzzer/profiles (I assume the fuzzer will read from the profiles sub-directory).

Nice!

The proper way to upload seed corpus is to put it into color_transform_fuzzer_static directory (https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/efficient_fuzzer.md#seed-corpus)

Also, it's better to minimize seed corpus before uploading (this piece is missing in the doc, I'll add it right now).

I minimized the profiles you've uploaded:

./color_transform_fuzzer -merge=1 ./color_profiles_minimized ./color_profiles

It produced 449 files giving the same coverage as the initial ~3K files. I uploaded those to gs://clusterfuzz-corpus/libfuzzer/color_transform_fuzzer_static/profiles/

Thanks for these tips and for updating the docs.  I created static directories for our other color space fuzzers

  https://cs.chromium.org/search/?q=qcms_color_space_fuzzer
  https://cs.chromium.org/search/?q=skia_color_space_fuzzer

and copied the minimized color profile corpus to their /profile directory

  gs://clusterfuzz-corpus/libfuzzer/qcms_color_space_fuzzer_static/profiles
  gs://clusterfuzz-corpus/libfuzzer/skia_color_space_fuzzer_static/profiles

Coverage was 8% percent when filing this issue.  It has climbed to 19% with the change herein.

Awesome!