All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=617519

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg7OWgqwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgnLH1oQkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgnN_uvAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgnI7qqQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgnKrDsgoM


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

android-galaxy-s5
chromium-rel-mac11
chromium-rel-win10
win-zenbook

===== 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@396926  592.265  62.9106  18  good
chromium@396928  592.958  51.7978  18  bad

Bisect job ran on: winx64_zen_perf_bisect
Bug ID: 617519

Test Command: src/tools/perf/run_benchmark -v --browser=release_x64 --output-format=chartjson --upload-results --also-run-disabled-tests speedometer
Test Metric: BackboneJS-TodoMVC/BackboneJS-TodoMVC
Relative Change: 6.28%
Score: 0

Buildbot stdio: http://build.chromium.org/p/tryserver.chromium.perf/builders/winx64_zen_perf_bisect/builds/182
Job details: https://chromeperf.appspot.com/buildbucket_job_status/9010621298965629168


Not what you expected? We'll investigate and get back to you!
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5835844452089856

| 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!

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


===== SUSPECTED CL(s) =====
Subject : Expand WTF::StringView's API to be more like StringPiece.
Author  : esprehn
Commit description:
  
StringView no longer owns the string passed into it, and can now wrap
a raw ptr to some characters.

This allows us to leverage the inline strlen optimization where the
compiler will embed the length of literal strings into the binary. It
also allows the deletion many overloaded methods that used to take
an LChar*, UChar* or String and can now just take a StringView instead.

For example the two constructors in TextRun are now a single one that
takes a StringView. This needed to be done in this patch to avoid
ambiguous constructors.

Future patches will replace CSSParserString with StringView, and also
vastly simplify the huge number of overloads on various methods. We'll
also expand the API surface of StringView to include the many useful
operations that StringPiece has.

This was originally committed as:
https://crrev.com/330deea56e27bc760fa52101040a51428bb7f582 but was
reverted due an incorrect assert in the
StringView(const UChar*, unsigned length) constructor. The assert
was incorrectly calling lengthOfNullTerminatedString on the UChar
in the assert, but this constructor is used for byte sequences which
are not null terminated.

BUG= 615174 

Review-Url: https://codereview.chromium.org/2007103003
Cr-Commit-Position: refs/heads/master@{#396942}
Commit  : 9b0aad1eca55ac75f437789514224e9b922fe514
Date    : Tue May 31 21:53:32 2016


===== TESTED REVISIONS =====
Revision         Mean     Std Dev  N   Good?
chromium@396926  789.255  11.6184  8   good
chromium@396939  792.822  14.7461  18  good
chromium@396941  805.667  15.7999  41  good
chromium@396942  818.769  15.2458  41  bad    <--
chromium@396943  821.242  18.675   41  bad
chromium@396946  824.185  17.2545  8   bad
chromium@396952  826.848  17.7197  8   bad

Bisect job ran on: mac_10_11_perf_bisect
Bug ID: 617519

Test Command: src/tools/perf/run_benchmark -v --browser=release --output-format=chartjson --upload-results --also-run-disabled-tests speedometer
Test Metric: jQuery-TodoMVC/jQuery-TodoMVC
Relative Change: 4.10%
Score: 99.9

Buildbot stdio: http://build.chromium.org/p/tryserver.chromium.perf/builders/mac_10_11_perf_bisect/builds/663
Job details: https://chromeperf.appspot.com/buildbucket_job_status/9010608632187196784


Not what you expected? We'll investigate and get back to you!
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5776814421573632

| 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!