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This CL is reducing the ShapeRun cache size from 10k to 1k. Experiment
shows that there is no performance cost to reduce the cache size to
1k entries.

This is mostly a revert of :
  https://chromium-review.googlesource.com/c/chromium/src/+/2051976/

Bug: 1050793
Change-Id: Ic4624611186c39f75f2dbc549438b923d587ced0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2323141
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792606}