[automerger skipped] Prevent apps from spamming addAccountExplicitly. am: 551d70e1c8 am: 662fcc58ef -s ours am: 9290f7b31f -s ours am: ef4197a103 -s ours am: 4b8d2c671b -s ours am: 7bfdc11b72 -s ours am: d6cb9820fc -s ours am: f97ac6ff99 -s ours

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Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15624525

Change-Id: Ib242e3e1306f8eb5e1c5b8f2346de64afaf6d6bd