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: 6646abd4 am: 4404d4af am: 1ee344bf am: 4db4d306

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

Change-Id: Ifb73d7fa84c2b8606f9536ea5e37f33ba2a86a79