Phone Hub: Introduce ProfileType proto enum for Phone Hub API

The ProfileType enum helps distinguish whether the current phone profile
is a work profile or the default profile.

Bug: 1155244
Change-Id: I21a5f957c31ec1a8ceb4a39080a45ee62daf3ceb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2572703
Commit-Queue: Jimmy Gong <jimmyxgong@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833494}

chromeos/components/phonehub/proto/phonehub_api.proto

@@ -85,6 +85,11 @@ enum NotificationImportance {
   HIGH = 5;
 }
 
+enum ProfileType {
+  DEFAULT_PROFILE = 0;
+  WORK_PROFILE = 1;
+}
+
 message PhoneProperties {
   int32 battery_percentage = 1;
   ChargingState charging_state = 2;
@@ -100,6 +105,8 @@ message PhoneProperties {
   NotificationAccessState notification_access_state = 8;
 
   FindMyDeviceRingStatus ring_status = 9;
+
+  ProfileType profile_type = 10;
 }
 
 message App {