From the log data generated with --log-function-events we can create a
detailed model of a function's lifetime. The parse processor displays
several stats at a given time (percent and count) on a per function or
byte basis:
- preparsing
- parsing
- eager/lazy compiling
- execution

Bug: chromium:757467
Change-Id: I0ad5c9369c6a0628704e3caffb3920444ea603a9
Reviewed-on: https://chromium-review.googlesource.com/758641
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Mathias Bynens <mathias@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50234}