Revert of Move and rename TaskTimeTracker to public interface exposed to ...

Revert of Move and rename TaskTimeTracker to public interface exposed to WebThread, use in WebPerf Agent. (patchset #14 id:260001 of

[panickercorp, 2016-08-31 01:53:40]

The CQ bit was checked by panicker@google.com

[panickercorp, 2016-08-31 01:53:40]

Created Revert of Move and rename TaskTimeTracker to public interface exposed to
WebThread, use in WebPerf Agent.

[commit-bot: I haz the power, 2016-08-31 01:54:01]

The CQ bit was unchecked by commit-bot@chromium.org

[pfeldman, 2017-01-30 21:44:27]

Description was changed from

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Revert of Move and rename TaskTimeTracker to public interface exposed to
WebThread, use in WebPerf Agent. (patchset #14 id:260001 of
https://codereview.chromium.org/2259013003/ )

Reason for revert:
oops, unintentionally added to wrong CL

Original issue's description:
> Generalize TaskTimeTracker interface and expose WebThread. This is now used by
InspectorWebPerfAgent for Long Task Observer.
> 
> BUG=635596
> 
> Committed: https://crrev.com/d9caeb1b95bbdfab5aa7688e6ce143f018f58178
> Cr-Commit-Position: refs/heads/master@{#415051}

TBR=skyostil@chromium.org,caseq@chromium.org,alph@chromium.org,pfeldman@chrom...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=635596
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to

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Revert of Move and rename TaskTimeTracker to public interface exposed to
WebThread, use in WebPerf Agent. (patchset #14 id:260001 of
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