[automerger skipped] [DO NOT MERGE] Make GlobalScreenshot PendingIntents immutable am: f4eefc55c4 am: 4cccd0c4e3 -s ours am: 67bd3caef0 am: 2170554e98 am: bff57c4da0 am: 31dfceabe3 -s ours

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Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12773073

Change-Id: Iba446a07164401813b3c116d1d52f10b79b3ed09