Chrome Version: 60.0.3088.0
OS: x86_64

What steps will reproduce the problem?
(1) Build content shell
My config: --args=' cc_wrapper="/usr/bin/ccache" enable_nacl=false dcheck_always_on=false is_debug=false remove_webcore_debug_symbols=true clang_use_chrome_plugins=false linux_use_bundled_binutils=false use_jumbo_build=true'
(2) Run: ./content_shell --slow-down-raster-scale-factor=25 http://spielzeugz.de/html5/compare/dom-imgs-alpha.html
(slow-down-raster-scale-factor is used to simulate a run on a low-end device)

What is the expected result?
14-15 fps

What happens instead?
5-6 fps

This cause of this regression has been identified as the  Bug 750252  fix: https://chromium-review.googlesource.com/c/chromium/src/+/596503