I couldn't locate an issue filed by the build sheriffs relating a similar failure on the main waterfall builders.

Manually triggering some builds on the tryserver.chromium.perf builder to see if we can identify a culprit.

The candidates based on sheriff-o-matic are:
380443: Update V8 to version 5.1.99.  v8-autoroll@chromium.org
380444: Re-land: Enable XFA-Forms for the PDFium plugin. tsepez@chromium.org
380445: Consolidate SpdyFramer::WriteHeaderBlock() and SerializeHeaderBlockWithoutCompression(). bnc@chromium.org
380446: Net triage docs: Fix links, mention crashes on other platforms. mmenke@chromium.org