[automerger skipped] [DO NOT MERGE] Make GlobalScreenshot PendingIntents immutable am: 441247985a am: 40297a24eb am: 368eecbec0 -s ours am: b20d5c3add -s ours am: f69d6cfbbb am: 0bf1c91f92 -s ours am: 435a7cd8fb am: ecf2db455c

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

Change-Id: I7286da0ca4f2ee2b09a0b1daf7dd35291d699b25