Merge "Prevent apps from spamming addAccountExplicitly. See comment here for...

Merge "Prevent apps from spamming addAccountExplicitly. See comment here for the discussion on solution https://b.corp.google.com/issues/169762606#comment14" into rvc-dev am: c744a25d am: f577b865

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15624560

Change-Id: I5c551e1347288c565ea56252d8d1312c5c940c1b