It has been consistently failing since:

https://uberchromegw.corp.google.com/i/chromium.perf/builders/Linux%20Builder/builds/129451

The only CL in the blamelist was 
=============
Roll src/third_party/pdfium/ c3d3bb2a0..f6f68c75c (1 commit)

https://pdfium.googlesource.com/pdfium.git/+log/c3d3bb2a036b..f6f68c75ce54

$ git log c3d3bb2a0..f6f68c75c --date=short --no-merges --format='%ad %ae %s'
2017-07-07 rharrison Check that there is enough data remaining in source BMP before reading

Created with:
  roll-dep src/third_party/pdfium
BUG= 738635 


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: Ifbb658f4beac53166e569be5eb973c9d0308c042
Reviewed-on: https://chromium-review.googlesource.com/563819
Reviewed-by: <pdfium-deps-roller@chromium.org>
Commit-Queue: <pdfium-deps-roller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485029}
=====================