arc: Record that ToS was shown to user in OOBE.

This stores flag that ARC ToS was shown in OOBE flow.

Test: Manually
Bug: b/73788995
Change-Id: I9e0060b1eb6520f39fd4dfc529226b9fadb8becf
Reviewed-on: https://chromium-review.googlesource.com/973753
Reviewed-by: Xiyuan Xia <[email protected]>
Reviewed-by: Hidehiko Abe <[email protected]>
Commit-Queue: Yury Khmel <[email protected]>
Cr-Commit-Position: refs/heads/master@{#546571}
diff --git a/components/arc/arc_prefs.h b/components/arc/arc_prefs.h
index 3e97fc4..46b3bfd 100644
--- a/components/arc/arc_prefs.h
+++ b/components/arc/arc_prefs.h
@@ -20,6 +20,7 @@
 ARC_EXPORT extern const char kArcEnabled[];
 ARC_EXPORT extern const char kArcPolicyComplianceReported[];
 ARC_EXPORT extern const char kArcTermsAccepted[];
+ARC_EXPORT extern const char kArcTermsShownInOobe[];
 ARC_EXPORT extern const char kArcLocationServiceEnabled[];
 ARC_EXPORT extern const char kArcPackages[];
 ARC_EXPORT extern const char kArcPaiStarted[];