[omnibox] Experimental feature of tab switch suggestion dedicated rows

Using the previously added submatch support, this CL allows
tab switch suggestions to be separate suggestions below their
parent suggestion. Instead of clicking a button to activate
the tab switch, this change allows selecting a special
suggestion.

Bug: 995935
Change-Id: I039e879f1b330cf9b17755daf9134013451cd9f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1762827
Commit-Queue: Kevin Bailey <[email protected]>
Reviewed-by: manuk hovanesian <[email protected]>
Cr-Commit-Position: refs/heads/master@{#689115}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index c2b3fae..5f5cae5 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -1678,6 +1678,9 @@
 extern const char kOmniboxTabSwitchSuggestionsName[];
 extern const char kOmniboxTabSwitchSuggestionsDescription[];
 
+extern const char kOmniboxTabSwitchSuggestionsDedicatedRowName[];
+extern const char kOmniboxTabSwitchSuggestionsDedicatedRowDescription[];
+
 extern const char kOmniboxWrapPopupPositionName[];
 extern const char kOmniboxWrapPopupPositionDescription[];