Reland "Make the mapping between panels information and VDOM elements explicit"
Reland "Make the mapping between panels information and VDOM elements explicit"

This reverts commit d75362abb683d34c82cdc2e89e3fbbabb2d2c63b.

Reason for revert: with r.android.com/2049761 submitted, the problem
does not appear anymore

Change-Id: I89800d9c325cabead514d0b1cf70721f66046198

google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto