All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=886635

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=e230e3900af9e632cdb2168ca441b48504618defd2f13372d8a46f7a7791faef


Bot(s) for this bug's original alert(s):

Win 7 Nvidia GPU Perf

rendering.desktop - Benchmark documentation link:
  https://bit.ly/rendering-benchmarks

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/13d23304e40000

📍 Found significant differences after each of 2 commits.
https://pinpoint-dot-chromeperf.appspot.com/job/13d23304e40000

[Windows 7] Use OS drop shadow for bubble dialogs when Aero mode disabled by alancutter@chromium.org
https://chromium.googlesource.com/chromium/src/+/e86f0201184fcd9c399307e3c96ed4a15f9f8a15
44.45 → 46.72 (+2.271)

[Android] Improve keyboard height guessing accuracy pre M by fhorschig@chromium.org
https://chromium.googlesource.com/chromium/src/+/e1ad7ba05b457869d54d08af32b251a52b818fbc
45.4 → 47.48 (+2.076)

Understanding performance regressions:
  http://g.co/ChromePerformanceRegressions

Benchmark documentation link:
  https://bit.ly/rendering-benchmarks

https://chromium.googlesource.com/chromium/src/+/e86f0201184fcd9c399307e3c96ed4a15f9f8a15 is expected to consume more GPU resources as it enables the use of native window for our dialogs (bringing Windows 7 in line with Windows 10 and Chrome OS).

It seems unlikely that the Android-only changes affected Desktop at all.

This change in performance is explained by #4. There will be more GPU tasks now that we use native widgets instead of fake ones.