[automerger skipped] Merge "[DO NOT MERGE] Make GlobalScreenshot PendingIntents immutable" into oc-mr1-dev am: 09b6ab6bdf -s ours am: 6a3d33dfcf -s ours am: 523686c52b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12773216

Change-Id: I97af05fe31487483d461cdb34a17438096e2e01c