[automerger skipped] Merge "Add immutability flag to PendingIntents" into...

[automerger skipped] Merge "Add immutability flag to PendingIntents" into rvc-qpr-dev-plus-aosp am: 8699e310 -s ours am: 7bbe2475 -s ours

am skip reason: Change-Id Iae1489b9c8fa323448e60615e99ad96aee1cd1d7 with SHA-1 2d38f6e4 is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/13690207

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I728c18d154cce062c52d42dae97740876f82f803