[automerger skipped] Merge "[DO NOT MERGE] Make GlobalScreenshot PendingIntents immutable" into pi-dev am: be1f0f28 -s ours am: 8b691cfc am: 547f99bb -s ours am: f9052f79

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

Change-Id: I8d26ec7d4f47dc3f8b741e8dd84e5f205ec654eb