Reland of [testing/script] Switch run_telemetry_as_googletest.py to produce full json results format (patchset #1 id:1 of https://codereview.chromium.org/2408043002/ )

Reason for revert:
Mac 10.10 Tests & Mac 10.11 Tests are now swarmed:
https://uberchromegw.corp.google.com/i/chromium.mac/builders/Mac10.10%20Tests/builds/8831

https://uberchromegw.corp.google.com/i/chromium.mac/builders/Mac10.11%20Tests/builds/3344

Original issue's description:
> Revert of [testing/script] Switch run_telemetry_as_googletest.py to produce full json results format (patchset #2 id:20001 of https://codereview.chromium.org/2403913002/ )
>
> Reason for revert:
> Speculatively reverting this patch (suggested by findit) to see if it fixes Mac telemetry unit tests.
>
> https://uberchromegw.corp.google.com/i/chromium.mac/builders/Mac10.10%20Tests/builds/8276
>
> https://uberchromegw.corp.google.com/i/chromium.mac/builders/Mac10.10%20Tests/builds/8277
>
> Original issue's description:
> > [testing/script] Switch run_telemetry_as_googletest.py to produce full json results format
> >
> > BUG=649762
> >
> > Committed: https://crrev.com/caa3b797728c9337fcea7d108a087d005fa7f451
> > Cr-Commit-Position: refs/heads/master@{#424206}
>
> TBR=kbr@chromium.org,dpranke@chromium.org,nednguyen@google.com
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=649762
>
> Committed: https://crrev.com/12b54d66ba1ce9e7a6c729fdf136b5b5c257b6f2
> Cr-Commit-Position: refs/heads/master@{#424341}

TBR=kbr@chromium.org,dpranke@chromium.org,loyso@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=649762

Review-Url: https://codereview.chromium.org/2480273002
Cr-Commit-Position: refs/heads/master@{#430285}
1 file changed