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This change adds command-line flag `--tabbed` to IdleWakeups.

This flag makes IdleWakeups print its final summary only, in
tab-delimited format. Intermediate measurements and other
informational messages are skipped. This is useful for copying or
piping IdleWakeups' output to a spreadsheet for sharing and/or further
analysis, e.g., using clip:
`idlewakeups.exe --tabbed --stop-on-exit | clip`.

The tab-delimited output contains the following columns:
* Processes created
* Processes destroyed
* Context switches/sec, average
* CPU usage (%), average
* CPU usage (s)
* Private working set (MiB), average
* Power (W), average

Change-Id: Ie269737950eb0d6e183a89c8bef225c7790d257e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2468777Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Commit-Queue: Jesse McKenna <jessemckenna@google.com>
Cr-Commit-Position: refs/heads/master@{#818254}