Enable TypeScript for TimelineProfileTree.js
Enable TypeScript for TimelineProfileTree.js

Bug: 1011811
Change-Id: Ie305c5587c5019a16c2846c001d0727dd22c85f3
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2479126
Commit-Queue: Alex Rudenko <d8d88e7d7e77f69e23d1d1432231196fb8e02a62@chromium.org>
Reviewed-by: Simon Zünd <38944668e9e2ca98ccd0275b53370f90fa55c113@chromium.org>

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