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Plumb the code to get an experiment for studying the best
ShapeRuns cache size.

The entries of these cache are part of the top allocations
in chrome browser process (based on memlog reports).

Bug: 1050793
Change-Id: I51ca6aebfe6c8ae3881eb3c03a56b4d472216ec7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2051976
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741161}