[automerger skipped] Merge "[DO NOT MERGE] Make GlobalScreenshot PendingIntents immutable" into oc-mr1-dev am: 09b6ab6bdf -s ours am: 6a3d33dfcf -s ours am: 523686c52b am: d57c2cec33 -s ours am: 9f188f3867

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

Change-Id: I38ef0470f95853590397c248dcba18bc56199074