Chrome Version: Version 70.0.3503.0 (Developer Build) (64-bit)
OS: MacOS High Sierra (10.13.6)

What steps will reproduce the problem?
(1) Compile custom chrome (gn flags don't seem to matter)
(2) Start it via out/Release/Chromium.app/Contents/MacOS/Chromium
(3) Navigate to https://web.autocad.com

What is the expected result?
Webpage loads

What happens instead?
Browser freezes. Only way to kill it is "Force Quit".

Note that the same binary can be used if launched via Finder (double-click on "out/Release/Chromium.app"). According to the output of "ps -aux | grep Chromium", this also just launches the Chromium binary without further arguments. But something is different.