Omnibox UI Experiments: Add vertical margin variations to about:flags

chrome/browser/flag_descriptions.h

Index: chrome/browser/flag_descriptions.h
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 3074292b1be5be7238b28e9081c3ea9a27e23e59..ee6ba3958dfbb58ffecc15680d87da3e30b084bc 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -3359,6 +3359,12 @@ extern const char kOmniboxDisplayTitleForCurrentUrlName[];
 // for current URL.
 extern const char kOmniboxDisplayTitleForCurrentUrlDescription[];
 
+// Name of the Omnibox UI vertical margin flag.
+extern const char kOmniboxUIVerticalMarginName[];
+
+// Description of the Omnibox UI vertical margin flag.
+extern const char kOmniboxUIVerticalMarginDescription[];
+
 // Name of the flag that forces Network Quality Estimator (NQE) to always
 // return the specified effective connection type.
 extern const char kForceEffectiveConnectionTypeName[];