All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=651803

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICglce_pgoM


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

android-nexus5X

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/9000093987008870384

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


===== SUSPECTED CL(s) =====
Subject : Idle cleanup for worker context
Author  : ericrk
Commit description:
  
Currently, Skia flushes unused items out of its caches after ~1 second
of non-use (50 flushes). This works fine while Skia is in-use, but when
a worker context goes idle we stop calling into Skia altogether. This
means that Skia will never flush out unused cache items from the last
piece of work it did. This can lead to some rather large temporaries
being kept around (~20mb).

This change adds an idle cleanup process which flushes Skia's caches
and cleans up worker context resources after a worker context is idle
for 1 second.

BUG= 624630 
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel;master.tryserver.blink:linux_precise_blink_dbg

Committed: https://crrev.com/051ae83bf29b52cefd82235ebfb90f203912afbb
Review-Url: https://codereview.chromium.org/2353033003
Cr-Original-Commit-Position: refs/heads/master@{#420496}
Cr-Commit-Position: refs/heads/master@{#421092}
Commit  : 6714c23b526197220d8b9abdbd38b6d9c206d912
Date    : Tue Sep 27 03:37:20 2016


===== TESTED REVISIONS =====
Revision         Mean     Std Dev    N  Good?
chromium@421066  4.1237   0.0455333  5  good
chromium@421082  4.16398  0.0265539  5  good
chromium@421090  4.1733   0.0745681  5  good
chromium@421091  4.14444  0.0498725  5  good
chromium@421092  4.92205  0.0679366  5  bad    <--
chromium@421094  4.9719   0.0284724  5  bad
chromium@421097  5.02135  0.0573073  5  bad

Bisect job ran on: android_nexus5X_perf_bisect
Bug ID: 651803

Test Command: src/tools/perf/run_benchmark -v --browser=android-chromium --output-format=chartjson --upload-results --also-run-disabled-tests thread_times.key_idle_power_cases
Test Metric: tasks_per_second_total_all/animated-gif.html
Relative Change: 21.77%
Score: 99.9

Buildbot stdio: http://build.chromium.org/p/tryserver.chromium.perf/builders/android_nexus5X_perf_bisect/builds/711
Job details: https://chromeperf.appspot.com/buildbucket_job_status/9000093987008870384


Not what you expected? We'll investigate and get back to you!
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5550531940974592

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