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[css-grid] Add perf test for lots of spanning items

There are already some perf tests with lots of grid items, but they only
span a single track. The track sizing algorithm handles contributions
from items with a span of 1 in a simpler way than when the span is
greater than 1. So testing the >1 case is useful.

This patch adds a copy of the auto-grid-lots-of-data.html perf test, but
using items with a span of 2 instead of 1.

Spec: https://drafts.csswg.org/css-grid/#algo-spanning-items

Bug: 1021929
Change-Id: Ifd73e28a72128113416b20d7934b96c353e93969
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1901286Reviewed-by: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: Manuel Rego <rego@igalia.com>
Commit-Queue: Oriol Brufau <obrufau@igalia.com>
Cr-Commit-Position: refs/heads/master@{#713293}