GitLab

Adds ProcessFilterConfig part to TraceConfig. The functionality
allows clients to whitelist processes that need to record traces.

It is going to be used by DevTools to limit the trace collection
to inspected processes. It will greatly reduce overhead of performance
recording, especially when it is being run in a browser having lots
of tabs open.

BUG=849887

Change-Id: I6395170509cd9b2ff688ee675a768393d0e95c8a
Reviewed-on: https://chromium-review.googlesource.com/1087947Reviewed-by: Elijah Taylor <elijahtaylor@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Siddhartha S <ssid@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: oysteine <oysteine@chromium.org>
Commit-Queue: Alexei Filippov <alph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571274}