Using the per-revision bisect providing the bisect results,
Good build : 58.0.2998.0 (Revision: 447146) - ignore the regression in bug report..
Bad build : 58.0.2999.4 (Revision: 447413)

You are probably looking for a change made after 447309 (known good), but no later than 447310 (first known bad).
CHANGELOG URL:
The script might not always return single CL as suspectas some perf builds might get missing due to failure.
  https://chromium.googlesource.com/chromium/src/+log/b6f1374b024b68b909ffb632b5a8c184391476bf..a2176d0c08e0a2367c91c2edb8ae255f185130ae

scottchen@, could you please check the issue and help..

This appears to only happening when you increase the text size with that toggle.

This is happening now because we added a default line-height to all text, which makes the "tiny" and "huge" text have a 90px line-height, which seems to be the correct behavior to me. 

The real bug here seems to be that the "tiny" and "huge" text stayed 12px, when really, it should increase/decrease in size like all the other texts on the settings page. 

+bettes@ could you please confirm whether or not we want "tiny" and "huge" to change in size? if so, I'll change it to use relative font-size as opposed to the 12px hard-coded size we have now.

Friendly ping to get an update on this.

Thanks.

Able to reproduce the issue in mac os 10.12.3 using chrome M59 #59.0.3047 .

@Could someone please provide us an update on this issue. 

Thanks!