Omnibox UI Experiments: Add feature flags for 3 URL elision experiments.

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 a814bb1d1190aa5b909828e9b9d1a204e1b322c9..8fd924055d21ef8b5b21704ec5e3bd233ed28b9d 100644
--- a/components/omnibox/browser/omnibox_field_trial.cc
+++ b/components/omnibox/browser/omnibox_field_trial.cc
@@ -91,6 +91,22 @@ const base::Feature kUIExperimentMaxAutocompleteMatches{
     "OmniboxUIExperimentMaxAutocompleteMatches",
     base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Feature used for hiding the suggestion URL path as a UI experiment.
+const base::Feature kUIExperimentHideSuggestionUrlPath{
+    "OmniboxUIExperimentHideSuggestionUrlPath",
+    base::FEATURE_DISABLED_BY_DEFAULT};
+
+// Feature used for hiding the suggestion URL scheme as a UI experiment.
+const base::Feature kUIExperimentHideSuggestionUrlScheme{
+    "OmniboxUIExperimentHideSuggestionUrlScheme",
+    base::FEATURE_DISABLED_BY_DEFAULT};
+
+// Feature used for hiding the suggestion URL subdomain as a UI experiment.
+// This only hides some trivially informative subdomains such as "www" or "m".
+const base::Feature kUIExperimentHideSuggestionUrlTrivialSubdomains{
+    "OmniboxUIExperimentHideSuggestionUrlTrivialSubdomains",
+    base::FEATURE_DISABLED_BY_DEFAULT};
+
 // Feature used for the omnibox narrow suggestions dropdown UI experiment.
 const base::Feature kUIExperimentNarrowDropdown{
     "OmniboxUIExperimentNarrowDropdown", base::FEATURE_DISABLED_BY_DEFAULT};