When resizing a window on some of our build logs, layout takes ~500ms. It's all plain text and from what I can see no layout is actually changed, just scrollbars are updated.

Here's a sample log (which may or may not disappear, but you can grab any latest large log for repro)

https://build.chromium.org/p/chromium.gpu.fyi/builders/Win7%20Release%20%28NVIDIA%29/builds/27151/steps/trace_test%20on%20NVIDIA%20GPU%20on%20Windows%20on%20Windows-2008ServerR2-SP1/logs/stdio

I just wanted to file a bug to see if people had any thoughts or ideas on how we can improve this / optimize this. 

(assigning to eae@ as per discussion with chrishtr@)