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The original code interprets "rate" (the second argument) in
millisecond units. However, by definition, it is the number of
key events per second.

Bug: 1141473
Test: Ran on DUT. Ran unittest locally.
Change-Id: Iccdcd2c1e5fc3160da054617bc3e173bb23e9657
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2507412
Commit-Queue: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827223}