All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=755090

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=f04d2208df02be125cc3323db943039f2108ca11487a8dbb949f3007cd7bd0dc


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

android-nexus5X
android-nexus6
android-nexus7v2

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8971299363820411456

=== BISECT JOB RESULTS ===
Perf regression found with culprit

Suspected Commit
  Author : Ulan Degenbaev
  Commit : d09f9c424fbc0c5679fd7c370c70c8915b29d987
  Date   : Thu Aug 10 08:56:49 2017
  Subject: [runtime] Do not clear prototype map descriptors.

Bisect Details
  Configuration: android_nexus5X_perf_bisect
  Benchmark    : v8.browsing_mobile
  Metric       : memory:chrome:renderer_processes:reported_by_chrome:v8:heap:allocated_objects_size_avg/browse_social/browse_social_tumblr_infinite_scroll
  Change       : 11.54% | 29578802.0406 -> 32992838.3205

Revision                           Result                   N
chromium@493265                    29578802 +- 1778476      6      good
chromium@493369                    29682991 +- 1743995      6      good
chromium@493370                    29706615 +- 1940470      6      good
chromium@493370,v8@80423e89b1      29404012 +- 1151517      6      good
chromium@493370,v8@d09f9c424f      32964330 +- 662861       6      bad       <--
chromium@493371                    33207374 +- 2312717      6      bad
chromium@493373                    32913665 +- 1449142      6      bad
chromium@493376                    33353287 +- 1849517      6      bad
chromium@493382                    32575902 +- 2803503      6      bad
chromium@493395                    33312694 +- 1027785      6      bad
chromium@493421                    32923850 +- 4189443      9      bad
chromium@493473                    32992838 +- 1866747      6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=android-chromium --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=browse.social.tumblr.infinite.scroll v8.browsing_mobile

More information on addressing performance regressions:
  http://g.co/ChromePerformanceRegressions

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8971299363820411456


For feedback, file a bug with component Speed>Bisection