The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/overlays/board-overlays/+/6aa0174ce11c0b99217d71d378fb1bd7c1c11e6e

commit 6aa0174ce11c0b99217d71d378fb1bd7c1c11e6e
Author: Manoj Gupta <manojgupta@google.com>
Date: Thu Jan 10 03:52:10 2019

amd64-generic: Add msan-fuzzer profile.

We want to enable msan fuzzing on Chrome OS. As a first
step, add the msan-fuzzer profile.

BUG=chromium:920355
TEST=./setup_board --board=amd64-generic --profile=msan-fuzzer works.

Change-Id: Icbeba7c7f5f20012611534b8bd6ddcd2e6e6f4a0
Reviewed-on: https://chromium-review.googlesource.com/1403934
Commit-Ready: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Caroline Tice <cmtice@chromium.org>
Reviewed-by: Jonathan Metzman <metzman@chromium.org>

[add] https://crrev.com/6aa0174ce11c0b99217d71d378fb1bd7c1c11e6e/overlay-amd64-generic/profiles/msan-fuzzer/parent
[add] https://crrev.com/6aa0174ce11c0b99217d71d378fb1bd7c1c11e6e/overlay-amd64-generic/profiles/msan-fuzzer/make.defaults

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/6fa974680bcd6258737359fb1aff42cd0f7c8d5f

commit 6fa974680bcd6258737359fb1aff42cd0f7c8d5f
Author: Manoj Gupta <manojgupta@google.com>
Date: Thu Jan 10 12:49:54 2019

libc++: Build with memory sanitizer support.

Enabling msan requires libc++ to be built with msan support.
So pass the memory sanitizer option to cmake with USE=msan.

BUG=chromium:920355
TEST=USE=msan emerge-amd64-generic libcxx works.

Change-Id: Ifa759e01c8a71321f2ae3b91a4148980b5342729
Reviewed-on: https://chromium-review.googlesource.com/1297062
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Luis Lozano <llozano@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>

[modify] https://crrev.com/6fa974680bcd6258737359fb1aff42cd0f7c8d5f/sys-libs/libcxxabi/libcxxabi-7.0.0.ebuild
[rename] https://crrev.com/6fa974680bcd6258737359fb1aff42cd0f7c8d5f/sys-libs/libcxx/libcxx-7.0.0-r5.ebuild
[modify] https://crrev.com/6fa974680bcd6258737359fb1aff42cd0f7c8d5f/sys-libs/libcxx/libcxx-7.0.0.ebuild
[rename] https://crrev.com/6fa974680bcd6258737359fb1aff42cd0f7c8d5f/sys-libs/libcxxabi/libcxxabi-7.0.0-r5.ebuild

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/c3c03dbf4056fe371044ebdf66ff33c53d5731ba

commit c3c03dbf4056fe371044ebdf66ff33c53d5731ba
Author: Manoj Gupta <manojgupta@google.com>
Date: Thu Jan 10 21:58:44 2019

chromium-os-fuzzers: Mask virglrenderer fuzzer in msan builds.

virglrenderer fuzzer Makefile is hardcoding asan via
"-fsanitize=address" which is incompatible with msan.

Exclude virglrenderer from msan fuzzing builds till the hardcoded flags
are fixed.

BUG=chromium:898289
BUG=chromium:920355

TEST=./build_packages target-fuzzers work with USE=msan.

Change-Id: I96a3589e7759e235c10b6f0ee9e81ac8a6d1df0f
Reviewed-on: https://chromium-review.googlesource.com/1404138
Commit-Ready: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Caroline Tice <cmtice@chromium.org>
Reviewed-by: Jonathan Metzman <metzman@chromium.org>

[modify] https://crrev.com/c3c03dbf4056fe371044ebdf66ff33c53d5731ba/virtual/chromium-os-fuzzers/chromium-os-fuzzers-1.ebuild
[rename] https://crrev.com/c3c03dbf4056fe371044ebdf66ff33c53d5731ba/virtual/chromium-os-fuzzers/chromium-os-fuzzers-1-r25.ebuild

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/chromite/+/aadb6391040e63da801e56e8418a232bbaf78aeb

commit aadb6391040e63da801e56e8418a232bbaf78aeb
Author: Manoj Gupta <manojgupta@google.com>
Date: Fri Jan 18 21:10:00 2019

chromeos_config: Add amd64-generic-msan-fuzzer builder.

Need a msan-fuzzer builder to upload msan fuzzing artifacts.

BUG=chromium:920355
TEST=msan-fuzzer profile exist and should build.

Change-Id: I7e6e93dd7415f6deaac0a0eb0984cbc4d3aac640
Reviewed-on: https://chromium-review.googlesource.com/1422857
Commit-Ready: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Jason Clinton <jclinton@chromium.org>

[modify] https://crrev.com/aadb6391040e63da801e56e8418a232bbaf78aeb/config/chromeos_config.py
[modify] https://crrev.com/aadb6391040e63da801e56e8418a232bbaf78aeb/config/waterfall_layout_dump.txt
[modify] https://crrev.com/aadb6391040e63da801e56e8418a232bbaf78aeb/config/config_dump.json
[modify] https://crrev.com/aadb6391040e63da801e56e8418a232bbaf78aeb/config/luci-scheduler.cfg

Builder link: https://cros-goldeneye.corp.google.com/chromeos/legoland/builderHistory?buildConfig=amd64-generic-msan-fuzzer&buildBranch=master

Set up the job on ClusterFuzz as experimental. 
Will circle back when I see results.

Looks like this won't just work since ClusterFuzz is failing to patch the MSAN binaries using patchelf as it tries to do. Will look into this.