[omnibox] Add a flag for bolding user text for search suggestions.

This CL adds a chrome://flags flag for crrev.com/c/1478030.

Bug: 931836
Change-Id: Id618d29f3c4a4720b6b540249f5d4f3a8bc85947
Reviewed-on: https://chromium-review.googlesource.com/c/1487183
Reviewed-by: Kevin Bailey <[email protected]>
Reviewed-by: Elly Fong-Jones <[email protected]>
Commit-Queue: manuk hovanesian <[email protected]>
Cr-Commit-Position: refs/heads/master@{#636144}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 1faafa8b..cfe3697 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -823,6 +823,9 @@
 extern const char kOmniboxUIBlueTitlesOnPageSuggestionsName[];
 extern const char kOmniboxUIBlueTitlesOnPageSuggestionsDescription[];
 
+extern const char kOmniboxUIBoldUserTextOnSearchSuggestionsName[];
+extern const char kOmniboxUIBoldUserTextOnSearchSuggestionsDescription[];
+
 extern const char kOmniboxUIHideSteadyStateUrlSchemeName[];
 extern const char kOmniboxUIHideSteadyStateUrlSchemeDescription[];