handoff: Fix the origin so that it correctly reflects the sender.

components/handoff/handoff_utility.h

Index: components/handoff/handoff_utility.h
diff --git a/components/handoff/handoff_utility.h b/components/handoff/handoff_utility.h
index 3aa3504e690a1863fa9910d1795a4d7e7a020416..92ccc5d035a321c1c5da9c40829609b2d9905255 100644
--- a/components/handoff/handoff_utility.h
+++ b/components/handoff/handoff_utility.h
@@ -35,6 +35,9 @@ enum Origin {
 // Returns ORIGIN_UNKNOWN if |string| is nil or unrecognized.
 Origin OriginFromString(NSString* string);
 
+// Returns nil if |origin| is not ORIGIN_IOS or ORIGIN_MAC.
+NSString* StringFromOrigin(Origin origin);
+
 }  // namespace handoff
 
 #endif  // COMPONENTS_HANDOFF_HANDOFF_UTILITY_H_