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the formatted tree

Correct implementation of
https://chromium-review.googlesource.com/c/chromium/src/+/2412192:
* optimal since children are not populated and not appended into
a tree dictionary structure
* clean because all logic is kept by tree formatter

Bug: n/a
Change-Id: Ic4108c407d6f6d9b4786dd188efbd57b4648684d
AX-Relnotes: n/a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2481762Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Alexander Surkov <asurkov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#818605}