[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 am: fa6aefeac1

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

Change-Id: Ic255de229c9812ce8e752b847a73b3776e20fd72