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

components/handoff/handoff_utility.mm

Index: components/handoff/handoff_utility.mm
diff --git a/components/handoff/handoff_utility.mm b/components/handoff/handoff_utility.mm
index ba4c6efa0187e282094bae27a774a04bea724a5c..de20e6964d763bec2310937c9b9eeec81be9962c 100644
--- a/components/handoff/handoff_utility.mm
+++ b/components/handoff/handoff_utility.mm
@@ -21,4 +21,15 @@ Origin OriginFromString(NSString* string) {
   return ORIGIN_UNKNOWN;
 }
 
+NSString* StringFromOrigin(Origin origin) {
+  switch (origin) {
+    case ORIGIN_IOS:
+      return kOriginiOS;
+    case ORIGIN_MAC:
+      return kOriginMac;
+    default:
+      return nil;
+  }
+}
+
 }  // namespace handoff