[automerger skipped] Merge "[DO NOT MERGE] Make GlobalScreenshot PendingIntents immutable" into pi-dev am: be1f0f2863 -s ours am: 8b691cfcea

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12773074

Change-Id: I2565ed28629196b6292f0f699e5370e34375a93d