Merge "Add a way to record causePackages for rollbacks."

api/system-current.txt

core/java/android/content/rollback/IRollbackManager.aidl

core/java/android/content/rollback/RollbackInfo.java

core/java/android/content/rollback/RollbackManager.java

...m/android/server/rollback/RollbackManagerServiceImpl.java

...ndroid/server/rollback/RollbackPackageHealthObserver.java

.../core/java/com/android/server/rollback/RollbackStore.java

...backTest/src/com/android/tests/rollback/RollbackTest.java

...est/src/com/android/tests/rollback/RollbackTestUtils.java