UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 YaBrowser/16.9.1.466 (beta) Safari/537.36

Steps to reproduce the problem:
1. Try clang from runhooks vs clang built using PGO and observe 20% time savings

What is the expected behavior?
The clang bundled using hooks should be built with PGO to save
time while building chromium

What went wrong?
Too many time waste :)

Did this work before? No 

Chrome version: 52.0.2743.116  Channel: n/a
OS Version: 
Flash Version: 

See discussion here: https://groups.google.com/a/chromium.org/forum/?utm_source=digest&utm_medium=email#!topic/chromium-dev/A3pWgkaSNrw