GitLab

Also adds a GetProcessNodeForRenderProcessHostId accessor to
PerformanceManager.

R=fdoray

Bug: 1080672
Change-Id: I3c2ceb14643833867d836c06c8d409889e24ba46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2456667
Commit-Queue: Joe Mason <joenotcharles@chromium.org>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816895}