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They were to evaluate paint performance with the cost of
GraphicsContext or DisplayItem constructor excluded. They were
meaningful when we developed the early versions of display-item-based
painting (Slimming Paint V1), but seem to provide little value
nowadays.

Change-Id: I7b2ebf90364c51cf65ed1b65cd376e0eafdd7df3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2090760
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747906}