Merge "[ui] Rename frontendLocalState -> timeline" into main am: a4488671e3 am: a7c053b64a am: 68877c47f1

Original change: https://android-review.googlesource.com/c/platform/external/perfetto/+/2873835

Change-Id: I7537103771c3e0aef852e3028b493fa50dfb92ab
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>