Roll Perfetto from aea3de1e710e to 70f19de5254b (3 revisions)

https://chromium.googlesource.com/external/github.com/google/perfetto.git/+log/aea3de1e710e..70f19de5254b

2025-08-13 lalitm@google.com sdk: fix sibling merge key behaviour (#2537)
2025-08-13 stevegolton@google.com ui: Fix 'Section' widget border colors for theme awareness (#2535)
2025-08-13 stevegolton@google.com ui: Tidy up borders a little in TabbedSplitPanel (#2536)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/perfetto-chromium-autoroll
Please CC perfetto-bugs@google.com,primiano@chromium.org,rasikan@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Chromium: https://bugs.chromium.org/p/chromium/issues/entry

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Cq-Include-Trybots: luci.chromium.try:linux-perfetto-rel
Bug: None
Tbr: perfetto-bugs@google.com,rasikan@google.com
Change-Id: I5229ff18d6b34eea4470caf422e67b6b408cbd04
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6841771
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Bot-Commit: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1500815}