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This change makes IdleWakeups aggregate only measurements taken while
the target process was running. Zero values taken while the process
was not running (output rows showing "0 processes") are excluded from
the final average and median.

This prevents 0 values during idle time from skewing down the final
results.

Change-Id: I10a301cf7e20da5b51db6e986f18c9b37d73d05b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2380198Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Commit-Queue: Jesse McKenna <jessemckenna@google.com>
Cr-Commit-Position: refs/heads/master@{#802781}