Rename distilation timer to be more specific.

Bug: none
Change-Id: I4fa78f50993fa9ee1abc36cdad5a06b0d035991b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7981319
Reviewed-by: Gustavo Martin <gusmartin@google.com>
Auto-Submit: Lauren Winston <lwinston@google.com>
Commit-Queue: Gustavo Martin <gusmartin@google.com>
Commit-Queue: Lauren Winston <lwinston@google.com>
Cr-Commit-Position: refs/heads/main@{#1651369}