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Found while working on Cluster Telemetry, subframes will be saved to the
wrong directory if capturing them is enabled. This CL fixes that
behavior by making the root_dir part of the document data.

Bug: 1025331
Change-Id: I39a82cca438da20368c6cb4692d628fb6aba2549
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1919545
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Reviewed-by: Ian Vollick <vollick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715850}