[automerger skipped] Merge "Allow empty tokens in strict grammar" into rvc-dev am: 5fa6de7421 -s ours
am skip reason: Change-Id Iac1cdd643253fd186a164b863d65d6e92698fd38 with SHA-1 b7cffcab32 is in history
Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/13554971
MUST ONLY BE SUBMITTED BY AUTOMERGER
Change-Id: Ia6aacc3b1417f9d3b144e97ed0e5346567044ce2
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