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No change to behavior, this only moves the value into a getter method
for both code paths.

This moves the cache size to a centrally-determined spot, since we may
want to create more complex logic for the value we set.

R=changwan@chromium.org

Bug: 893318,887538
Test: None
Change-Id: I0e22928bc37a247f165e3913b1e7007fa0d7a1f3
Reviewed-on: https://chromium-review.googlesource.com/c/1357331Reviewed-by: Changwan Ryu <changwan@chromium.org>
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613212}