[automerger skipped] (IMS Threading refactoring) Telephony IMS classes to schedule IMS callback on the main thread am: add3b8d76e am: 62a61e86a2 am: b5ccb150d6 am: e1d1318617 -s ours

am skip reason: Merged-In Icdb0750d63f242eb79351781a4b75ca745c30083 with SHA-1 0faae9de5e is already in history

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1964909

Change-Id: I25d4c5229707f67b47bc40aa3d6a3011f05d7255