Merge "[DO NOT MERGE] Make GlobalScreenshot PendingIntents immutable" into oc-dev am: d15b2f5bce am: 0d82d9ffc9

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12773217

Change-Id: Ie068c0cc838f65a20ab224a3c218ee8221e9f700