[omnibox] Add about:flag for OmniboxAlternateMatchDescriptionSeparator

Bug: 955585
Change-Id: Ifbb7814a2087c1a77f462836aabffbbe41a2e14e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1581987
Reviewed-by: Orin Jaworski <[email protected]>
Commit-Queue: Tommy Li <[email protected]>
Cr-Commit-Position: refs/heads/master@{#653756}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 4c8bddaa..a68e00cf 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -831,6 +831,9 @@
 extern const char kOfflineAutoReloadVisibleOnlyName[];
 extern const char kOfflineAutoReloadVisibleOnlyDescription[];
 
+extern const char kOmniboxAlternateMatchDescriptionSeparatorName[];
+extern const char kOmniboxAlternateMatchDescriptionSeparatorDescription[];
+
 extern const char kOmniboxDisplayTitleForCurrentUrlName[];
 extern const char kOmniboxDisplayTitleForCurrentUrlDescription[];