Merge "InputFlinger: Add DROP_INPUT and DROP_INPUT_IF_OBSCURED feature flags" into sc-v2-dev am: 4541ab50cb

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/15759271

Change-Id: I44c11757f6ffd3835091f1583e161a001af12cd9