Enable use of error prone annotations This is required for ag/26422309 Bug: 327646201 (cherry picked from https://googleplex-android-review.googlesource.com/q/commit:fc4001126819e1de5c429940e723d6be0b412fe4) Merged-In: I3fd69e865f5bb7c9b14adc8c20ab570d96fcb66f Change-Id: I3fd69e865f5bb7c9b14adc8c20ab570d96fcb66f