[automerger skipped] Expose and update the call forward/waiting APIs am: 8410239d72 am: 84a9653e18 am: af7d2858e3 am: 1f96efdae1 -s ours

am skip reason: Change-Id Ic20bc99314c8538a3f75f6af9c37bc4d30781825 with SHA-1 32634e1454 is in history

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1471162

Change-Id: I180c0191b72ddd568ca1b6cfc9db1bb1f017a244