[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

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

Change-Id: I561248e8710ab938825682fa4c96d320e0776538