All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=629109

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgiuPApwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgyo_bqQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgqpCXsQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgyvzpswoM


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

android-nexus7v2
android-nexus9

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/9006785252037871504

===== BISECT JOB RESULTS =====
Status: completed


=== Bisection aborted ===
The bisect was aborted because The metric values for the initial "good" and "bad" revisions do not represent a clear regression.
Please contact the the team (see below) if you believe this is in error.

=== Warnings ===
The following warnings were raised by the bisect job:

 * Bisect failed to reproduce the regression with enough confidence.

===== TESTED REVISIONS =====
Revision         Mean      Std Dev  N   Good?
chromium@405758  21704419  3093011  12  good
chromium@405783  22550925  1948216  12  bad

Bisect job ran on: android_nexus9_perf_bisect
Bug ID: 629109

Test Command: src/tools/perf/run_benchmark -v --browser=android-chromium --output-format=chartjson --upload-results --also-run-disabled-tests system_health.memory_mobile
Test Metric: load_media-memory:chrome:all_processes:reported_by_chrome:gpu:effective_size_avg/load_media_9gag
Relative Change: 4.31%
Score: 0

Buildbot stdio: http://build.chromium.org/p/tryserver.chromium.perf/builders/android_nexus9_perf_bisect/builds/1899
Job details: https://chromeperf.appspot.com/buildbucket_job_status/9006785252037871504


Not what you expected? We'll investigate and get back to you!
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5838990410776576

| O O | Visit http://www.chromium.org/developers/speed-infra/perf-bug-faq
|  X  | for more information addressing perf regression bugs. For feedback,
| / \ | file a bug with component Tests>AutoBisect.  Thank you!

The values seem to have improved (the most recent results are for r406043-r406090), so I'm marking this as WontFix.