Catch Runtime Exception thrown by ProtoOutputStream.flush() api

Bug: 429041152
Flag: EXEMPT minor bug fix
Test: manual testing

When any IOException is received during flush operation of ProtoOutputStream, a RuntimeException is re-throwed. Failing to catch this exception resulted in exit of system_server process.

Signed-off-by: Trong Vu <tvu28@ford.com>
(cherry picked from https://android-review.googlesource.com/q/commit:cf70673f483d1438a11acfeb6553462bc6f23113)
Merged-In: If408334dfee39d9884f385ed34bf37d6d5104131
Change-Id: If408334dfee39d9884f385ed34bf37d6d5104131