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-qpr-dev am: 54c29aa7

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15640700

Change-Id: I18503535c0ff31b561a7429881e86779cafaa0d3