Predator and CL did not provide any possible suspects.
Using Code Search for the file, "blink_png_decoder_fuzzer" assigning to the concern owner.
Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/1cc893851ef9ad007f4fb1eaabf58870fc634e81

@scroggo -- Could you please look into the issue, kindly re-assign if this is not related to your changes.
Thank You.

The ICCP chunk has a large profile_length. This was fixed in upstream libpng in https://github.com/glennrp/libpng/commit/92a7c79db2c962d04006b35e2603ba9d5ce75541

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b517d7963d19a277c9c2575120d510d048c25633

commit b517d7963d19a277c9c2575120d510d048c25633
Author: scroggo <scroggo@chromium.org>
Date: Fri Jun 16 21:07:44 2017

libpng: Reject oversized iCCP profile length

Bug:  729673 

cherry-pick of https://github.com/glennrp/libpng/commit/92a7c79db2c962d04006b35e2603ba9d5ce75541

Review-Url: https://codereview.chromium.org/2939383002
Cr-Commit-Position: refs/heads/master@{#480165}

[modify] https://crrev.com/b517d7963d19a277c9c2575120d510d048c25633/third_party/libpng/README.chromium
[modify] https://crrev.com/b517d7963d19a277c9c2575120d510d048c25633/third_party/libpng/png.c
[modify] https://crrev.com/b517d7963d19a277c9c2575120d510d048c25633/third_party/libpng/pngpriv.h
[modify] https://crrev.com/b517d7963d19a277c9c2575120d510d048c25633/third_party/libpng/pngtest.c

 Issue 737512  has been merged into this issue.

The following revision refers to this bug:
  https://pdfium.googlesource.com/pdfium/+/664d4b82ac5156488b7e437d4cc54a3ef94d2811

commit 664d4b82ac5156488b7e437d4cc54a3ef94d2811
Author: Lei Zhang <thestig@chromium.org>
Date: Wed Aug 23 20:55:09 2017

Reject oversized iCCP profile length in libpng.

cherry-pick of https://github.com/glennrp/libpng/commit/92a7c79db2c962d04006b35e2603ba9d5ce75541
BUG= chromium:729673 

Change-Id: I907b4920ed6d276a075a30269be1744aff678069
Reviewed-on: https://pdfium-review.googlesource.com/11690
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>

[add] https://crrev.com/664d4b82ac5156488b7e437d4cc54a3ef94d2811/third_party/libpng16/0004-invalid-icc.patch
[modify] https://crrev.com/664d4b82ac5156488b7e437d4cc54a3ef94d2811/third_party/libpng16/png.c
[modify] https://crrev.com/664d4b82ac5156488b7e437d4cc54a3ef94d2811/third_party/libpng16/README.pdfium
[modify] https://crrev.com/664d4b82ac5156488b7e437d4cc54a3ef94d2811/third_party/libpng16/pngpriv.h

 Issue 747747  has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d12b9a5c49c08c0cc7516a860dff0f14290c0ecf

commit d12b9a5c49c08c0cc7516a860dff0f14290c0ecf
Author: pdfium-deps-roller@chromium.org <pdfium-deps-roller@chromium.org>
Date: Thu Aug 24 00:18:00 2017

Roll src/third_party/pdfium/ 0924119ca..664d4b82a (1 commit)

https://pdfium.googlesource.com/pdfium.git/+log/0924119cae45..664d4b82ac51

$ git log 0924119ca..664d4b82a --date=short --no-merges --format='%ad %ae %s'
2017-08-23 thestig Reject oversized iCCP profile length in libpng.

Created with:
  roll-dep src/third_party/pdfium
BUG= 729673 


Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, see:
http://www.chromium.org/developers/tree-sheriffs/sheriff-details-chromium#TOC-Failures-due-to-DEPS-rolls


TBR=dsinclair@chromium.org

Change-Id: I4f68cd696f5e16ccacee623f5165d691745cdc09
Reviewed-on: https://chromium-review.googlesource.com/630536
Reviewed-by: <pdfium-deps-roller@chromium.org>
Commit-Queue: <pdfium-deps-roller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#496883}
[modify] https://crrev.com/d12b9a5c49c08c0cc7516a860dff0f14290c0ecf/DEPS