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With declarative Shadow DOM, the clone method has been updated to clone
templates that contain attached shadow DOM. This perf test exercises
that functionality.

Bug: 1042130
Change-Id: Ic31a298c722e10c55e130f704af9c7ccf4c8c72d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2448649
Commit-Queue: Mason Freed <masonfreed@chromium.org>
Commit-Queue: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814372}