Omnibox UI Experiments: Add flag to change max autocomplete matches.

components/omnibox/browser/omnibox_field_trial.cc

Index: components/omnibox/browser/omnibox_field_trial.cc
diff --git a/components/omnibox/browser/omnibox_field_trial.cc b/components/omnibox/browser/omnibox_field_trial.cc
index 7d652f9194822cebe2c5b2fa373f56f6e0981f0e..e106fa9090474565db539e6be4686147f8735dc4 100644
--- a/components/omnibox/browser/omnibox_field_trial.cc
+++ b/components/omnibox/browser/omnibox_field_trial.cc
@@ -80,6 +80,11 @@ const base::Feature kZeroSuggestSwapTitleAndUrl{
 const base::Feature kDisplayTitleForCurrentUrl{
     "OmniboxDisplayTitleForCurrentUrl", base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Feature used for the max autocomplete matches UI experiment.
+const base::Feature kUIExperimentMaxAutocompleteMatches{
+    "OmniboxUIExperimentMaxAutocompleteMatches",
+    base::FEATURE_DISABLED_BY_DEFAULT};
+
 // Feature used for the vertical margin UI experiment.
 const base::Feature kUIExperimentVerticalMargin{
     "OmniboxUIExperimentVerticalMargin", base::FEATURE_DISABLED_BY_DEFAULT};
@@ -740,6 +745,8 @@ const char
     OmniboxFieldTrial::kZeroSuggestRedirectToChromeAdditionalFieldsParam[] =
         "ZeroSuggestRedirectToChromeAdditionalFields";
 
+const char OmniboxFieldTrial::kUIMaxAutocompleteMatchesParam[] =
+    "UIMaxAutocompleteMatches";
 const char OmniboxFieldTrial::kUIVerticalMarginParam[] = "UIVerticalMargin";
 
 // static