[automerger skipped] [DO NOT MERGE] Make GlobalScreenshot PendingIntents immutable am: 44124798 am: 40297a24 am: 368eecbe -s ours am: b20d5c3a -s ours am: f69d6cfb am: 0bf1c91f -s ours am: 435a7cd8 am: ecf2db45 am: 255001d0 am: 06e81aa1 -s ours

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

Change-Id: Iad96dc34ab51557d690419a04a964d08943c2c1a