tree a41428ca907198578ce07132678ed088d67feecf
parent 39969f0288718d14b1873c5fa7ab1fb12ab338b2
author Jooyung Han <jooyung@google.com> 1579753406 +0900
committer Jooyung Han <jooyung@google.com> 1582187541 +0900

Use optional for nullable types

AIDL generates optional<T> for nullable T types for C++, which is more
efficient and idomatic and easy to use.

Bug: 144773267
Test: build/flash/boot
Merged-In: I98549c8614c9152d5d45e2f1f33f2f3c31a9bbbf
Change-Id: I98549c8614c9152d5d45e2f1f33f2f3c31a9bbbf
(cherry picked from commit 0568fd287cfc0affc8e985f21da3793cdda286a3)