@Justin: You might want to check out  https://crbug.com/847348 , I'm (wildly) guessing that it could have something to do with the mysterious rendering glitches you've been hunting.

In our downstream product we got similar blocky text as shown in the gif-animation here, although all our text was blocky all the time:
https://bugs.chromium.org/p/chromium/issues/detail?id=823209#c8.

The blocky text we got was due to wrong parsing of floats in Angle when using non en_US locale. We also use --in-process-gpu which I *think* Android WebView also use?

Thanks for the tip.  We can try removing the the state reset once that is fixed.