Assigning to concern owner who might be related to pdfium fuzzer.
@thestig -- Could you please look into the issue, kindly re-assign if this is not related to your changes.
Thank You.

I'll take it for now because thestig is OOO. Note: this is just timing out, not looping forever. I'll see what's taking up all the time.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7dcb520819f004e4751051a6cc6181b717b211b1

commit 7dcb520819f004e4751051a6cc6181b717b211b1
Author: pdfium-deps-roller <pdfium-deps-roller@chromium.org>
Date: Mon Jan 09 20:09:35 2017

Roll src/third_party/pdfium/ 661008dde..c589fdc5e (1 commit).

https://pdfium.googlesource.com/pdfium.git/+log/661008dde735..c589fdc5e4e9

$ git log 661008dde..c589fdc5e --date=short --no-merges --format='%ad %ae %s'
2017-01-06 npm HardClip all points used when building paths

BUG= 670524 , 678767 

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

Review-Url: https://codereview.chromium.org/2619373002
Cr-Commit-Position: refs/heads/master@{#442321}

[modify] https://crrev.com/7dcb520819f004e4751051a6cc6181b717b211b1/DEPS

ClusterFuzz has detected this issue as fixed in range 442293:442364.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=4676828670459904

Fuzzer: libfuzzer_pdfium_fuzzer
Job Type: libfuzzer_chrome_msan
Platform Id: linux

Crash Type: Timeout (exceeds 25 secs)
Crash Address: 
Crash State:
  pdfium_fuzzer
  
Sanitizer: memory (MSAN)

Regressed: https://cluster-fuzz.appspot.com/revisions?job=libfuzzer_chrome_msan&range=426009:426065
Fixed: https://cluster-fuzz.appspot.com/revisions?job=libfuzzer_chrome_msan&range=442293:442364

Minimized Testcase (0.74 Kb): https://cluster-fuzz.appspot.com/download/AMIfv96Y3HB0kWHErsx0r-OgeAOwxXBnCYzbT0IPcjgQTg0M44sFuzdvu79Spc0quWmdr_XU_rIl0rhs8qzHeiad9cHhIDJTEkhViXPYCE9CS1t4X8795SnECYMOaTw6BgN6NqZaYtp03gUUlti0IwlANN8XfLqO0UF_pxSgwF6eAmONvfWJHJ4r-hW2pZrYWo6tuiDuwKVkzB23D8nNdSB8BTBw3Lyk2t0VGD8kARSpzBBcT9dc1lMyikMAKxG27NtGrXqzNZBpor4Zfo-UTn6AjeyXPnmgMAeBlKDi-gxSzmyr0wGXc7nRDVjtC306dcbQSmCAb-mW1FDyp9-oVKimrbhvjLN5BB-ukDCwJ2lVVxXDdHeM1Zw?testcase_id=4676828670459904

See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reproducing.md for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.