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This change adds command-line flag --cpu-seconds to IdleWakeups. This
option makes IdleWakeups print absolute CPU time in seconds, rather
than as a percentage.

Because average and median CPU time in seconds are not meaningful
measurements, this also adds a "Sum" row to the summary. This row
appears only when --cpu-seconds is enabled, and displays only CPU
time.

Change-Id: I9bd4efd8712da9ac976eeb8dc435232c63170827
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441321Reviewed-by: Alex Gough <ajgo@chromium.org>
Commit-Queue: Jesse McKenna <jessemckenna@google.com>
Cr-Commit-Position: refs/heads/master@{#814030}