Merge "dumpstate: save background traces when a BR is captured." am: 8592b080ec am: 069ec16537 am: 2d69bdaa92

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1516517

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I729de4f188a3b2464178f366d06e60ae6851a878