Revert of Revert of Fixit: Factor out common base::Time* math operator overloads. (patchset #1 id:1 of https://codereview.chromium.org/1130953002/)

Reason for revert:
iOS_Device builder was not rebuilding certain modules dependent on changes in base::Time.  http://crbug.com/485435

Original issue's description:
> Revert of Fixit: Factor out common base::Time* math operator overloads. (patchset #2 id:40001 of https://codereview.chromium.org/1122443004/)
>
> Reason for revert:
> Broke iOS build.
>
> http://build.chromium.org/p/chromium.mac/builders/iOS_Device/builds/5621/steps/compile/logs/stdio
>
> Original issue's description:
> > Fixit: Factor out common base::Time* math operator overloads.
> >
> > This is part 1 of a 2-part change to fork base::TimeTicks into three
> > type-checked time classes (TimeTicks + ThreadTicks + TraceTicks).  The
> > forking of TimeTicks will ensure values from different clocks are not
> > erroneously being mixed together when doing time math.
> >
> > In this change, the identical comparison and math operator overloads
> > found in base::Time and base::TimeTicks are being factored-out into a
> > templated base class.  In a following change, this base class will also
> > be used to de-dupe this common functionality in the two new time
> > classes.
> >
> > BUG=467417
> >
> > Committed: https://crrev.com/7ca717095b4758cb76e53e904b775852e46d646d
> > Cr-Commit-Position: refs/heads/master@{#328696}
>
> TBR=thestig@chromium.org,miu@chromium.org
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=467417
>
> Committed: https://crrev.com/a365825583412c355a449274bec70e41e992ffd7
> Cr-Commit-Position: refs/heads/master@{#328706}

TBR=thestig@chromium.org,ksakamoto@chromium.org
NOPRESUBMIT=true
BUG=467417,485435

Review URL: https://codereview.chromium.org/1128273004

Cr-Commit-Position: refs/heads/master@{#328843}

0 files changed, 0 insertions, 0 deletions