All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=877603

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=643573c20db8fadc6d83285ebf2bce4a5ae725f17bcb440d2ef77647a1535f58


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

Android Nexus5 Perf
Android Nexus6 WebView Perf
android-nexus5x-perf

blink_perf.image_decoder - Benchmark documentation link:
  https://bit.ly/blink-perf-benchmarks

system_health.memory_mobile - Benchmark documentation link:
  https://bit.ly/system-health-benchmarks

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

memory.top_10_mobile - Benchmark documentation link:
  None

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/11f2aea6640000

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/112f3696640000

📍 Found a significant difference after 1 commit.
https://pinpoint-dot-chromeperf.appspot.com/job/112f3696640000

Remove Modern flag and hardcode #isChromeModernDesignEnabled to true by twellington@chromium.org
https://chromium.googlesource.com/chromium/src/+/5955e6d67f3799a0cdd9dba7df8fa5460499f99f
4.875e+07 → 5.048e+07 (+1.733e+06)

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

It looks like this is the same as  issue 877247 , which similarly reported a gpu memory regression when Modern is enabled.

miu@ - is it reasonable to mark this as a duplicate?

Also, the pinpoint job seems to specifically identify system_health.memory_mobile. I would be really surprised if the CL identified affected WebView performance since it was a visual redesign of Clank UI (code primary isolated to chrome/android/java).

Are there other pinpoint jobs need to identify culprits for the other alerts in comment #1?

miu@ - the pinpoint job in #6 identified a gpu regression that's already covered in  issue 877247 . Will you please confirm whether this bug can be closed or whether more work is needed to investigate the other alerts in the original bug report?

Sounds reasonable to me.