Use std::optional for nullable

AIDL now use std::optional to represent nullable types for efficiency
instead of std::unique_ptr which might cause additional heap allocation.

Bug: 1447732670
Test: m
Merged-In: I9045bc6fc2eb06839203af6db94a80de9b83ad1f
Change-Id: I9045bc6fc2eb06839203af6db94a80de9b83ad1f
(cherry picked from commit 3f9a3b407aeff0311038b2097d657446c4f98b90)

Exempt-From-Owner-Approval: CP from master
diff --git a/services/camera/libcameraservice/api2/CameraDeviceClient.cpp b/services/camera/libcameraservice/api2/CameraDeviceClient.cpp
index e35b436..022d686 100644
--- a/services/camera/libcameraservice/api2/CameraDeviceClient.cpp
+++ b/services/camera/libcameraservice/api2/CameraDeviceClient.cpp
@@ -54,7 +54,7 @@
         const sp<CameraService>& cameraService,
         const sp<hardware::camera2::ICameraDeviceCallbacks>& remoteCallback,
         const String16& clientPackageName,
-        const std::unique_ptr<String16>& clientFeatureId,
+        const std::optional<String16>& clientFeatureId,
         const String8& cameraId,
         int api1CameraId,
         int cameraFacing,
@@ -80,7 +80,7 @@
 CameraDeviceClient::CameraDeviceClient(const sp<CameraService>& cameraService,
         const sp<hardware::camera2::ICameraDeviceCallbacks>& remoteCallback,
         const String16& clientPackageName,
-        const std::unique_ptr<String16>& clientFeatureId,
+        const std::optional<String16>& clientFeatureId,
         const String8& cameraId,
         int cameraFacing,
         int clientPid,
diff --git a/services/camera/libcameraservice/api2/CameraDeviceClient.h b/services/camera/libcameraservice/api2/CameraDeviceClient.h
index 964c96a..e7e26da 100644
--- a/services/camera/libcameraservice/api2/CameraDeviceClient.h
+++ b/services/camera/libcameraservice/api2/CameraDeviceClient.h
@@ -50,7 +50,7 @@
     CameraDeviceClientBase(const sp<CameraService>& cameraService,
             const sp<hardware::camera2::ICameraDeviceCallbacks>& remoteCallback,
             const String16& clientPackageName,
-            const std::unique_ptr<String16>& clientFeatureId,
+            const std::optional<String16>& clientFeatureId,
             const String8& cameraId,
             int api1CameraId,
             int cameraFacing,
@@ -175,7 +175,7 @@
     CameraDeviceClient(const sp<CameraService>& cameraService,
             const sp<hardware::camera2::ICameraDeviceCallbacks>& remoteCallback,
             const String16& clientPackageName,
-            const std::unique_ptr<String16>& clientFeatureId,
+            const std::optional<String16>& clientFeatureId,
             const String8& cameraId,
             int cameraFacing,
             int clientPid,
diff --git a/services/camera/libcameraservice/api2/CameraOfflineSessionClient.h b/services/camera/libcameraservice/api2/CameraOfflineSessionClient.h
index b67fcb3..03621c8 100644
--- a/services/camera/libcameraservice/api2/CameraOfflineSessionClient.h
+++ b/services/camera/libcameraservice/api2/CameraOfflineSessionClient.h
@@ -48,7 +48,7 @@
             const KeyedVector<sp<IBinder>, sp<CompositeStream>>& offlineCompositeStreamMap,
             const sp<ICameraDeviceCallbacks>& remoteCallback,
             const String16& clientPackageName,
-            const std::unique_ptr<String16>& clientFeatureId,
+            const std::optional<String16>& clientFeatureId,
             const String8& cameraIdStr, int cameraFacing,
             int clientPid, uid_t clientUid, int servicePid) :
             CameraService::BasicClient(