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This adds collections of several "phases" for each process, evenly
spaced. Additional processing will allow to construct a list of startup
only / commonly called functions.

Bug: 758566
Change-Id: I644fc80af42451d62a7d5d71dd0506680de80cae
Reviewed-on: https://chromium-review.googlesource.com/840021
Commit-Queue: Benoit L <lizeb@chromium.org>
Reviewed-by: Matthew Cary <mattcary@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526004}