[omnibox] Add suggestion button row feature flag

This CL creates the OmniboxButtonRow feature flag for command-line.

Change-Id: I483bd37c212f0ff9bb558c170885ef71940aa77a
Bug: 1046523
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2024031
Commit-Queue: Orin Jaworski <orinj@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736157}

components/omnibox/browser/omnibox_field_trial.cc

@@ -650,6 +650,10 @@ bool OmniboxFieldTrial::IsShortBookmarkSuggestionsEnabled() {
          base::FeatureList::IsEnabled(omnibox::kAutocompleteTitles);
 }
 
+bool OmniboxFieldTrial::IsSuggestionButtonRowEnabled() {
+  return base::FeatureList::IsEnabled(omnibox::kOmniboxSuggestionButtonRow);
+}
+
 bool OmniboxFieldTrial::IsTabSwitchSuggestionsEnabled() {
   return base::FeatureList::IsEnabled(omnibox::kOmniboxTabSwitchSuggestions);
 }

components/omnibox/browser/omnibox_field_trial.h

@@ -383,6 +383,10 @@ bool IsReverseAnswersEnabled();
 // Returns true if the short bookmark suggestions flag is enabled.
 bool IsShortBookmarkSuggestionsEnabled();
 
+// Whether a single row of buttons is shown on suggestions with actionable
+// elements like keywords, tab-switch buttons, and Pedals.
+bool IsSuggestionButtonRowEnabled();
+
 // Returns true if either the tab switch suggestions flag is enabled.
 bool IsTabSwitchSuggestionsEnabled();
 

components/omnibox/common/omnibox_features.cc

@@ -316,16 +316,21 @@ const base::Feature kHistoryQuickProviderAllowMidwordContinuations{
 const base::Feature kConfirmOmniboxSuggestionRemovals{
     "ConfirmOmniboxSuggestionRemovals", base::FEATURE_DISABLED_BY_DEFAULT};
 
-// If enabled, allows Tab and Shift+Tab to escape the focus out of the omnibox
-// popup. Otherwise, Tab infinitely loops between suggestions in the popup.
-const base::Feature kTabKeyCanEscapeOmniboxPopup{
-    "TabKeyCanEscapeOmniboxPopup", base::FEATURE_DISABLED_BY_DEFAULT};
-
 // Feature that enables not counting submatches towards the maximum
 // suggestion limit.
 const base::Feature kOmniboxLooseMaxLimitOnDedicatedRows{
     "OmniboxLooseMaxLimitOnDedicatedRows", base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Feature that puts a single row of buttons on suggestions with actionable
+// elements like keywords, tab-switch buttons, and Pedals.
+const base::Feature kOmniboxSuggestionButtonRow{
+    "OmniboxSuggestionButtonRow", base::FEATURE_DISABLED_BY_DEFAULT};
+
+// If enabled, allows Tab and Shift+Tab to escape the focus out of the omnibox
+// popup. Otherwise, Tab infinitely loops between suggestions in the popup.
+const base::Feature kTabKeyCanEscapeOmniboxPopup{
+    "TabKeyCanEscapeOmniboxPopup", base::FEATURE_DISABLED_BY_DEFAULT};
+
 // When enabled, use Assistant for omnibox voice query recognition instead of
 // Android's built-in voice recognition service. Only works on Android.
 const base::Feature kOmniboxAssistantVoiceSearch{

components/omnibox/common/omnibox_features.h

@@ -65,11 +65,9 @@ extern const base::Feature kHistoryQuickProviderAllowMidwordContinuations;
 
 // Suggestions UI - these affect the UI or function of the suggestions popup.
 extern const base::Feature kConfirmOmniboxSuggestionRemovals;
-extern const base::Feature kTabKeyCanEscapeOmniboxPopup;
-
-// Flags related to new rows and managing rows in the Omnibox.
-// TODO(krb): Move more flags here.
 extern const base::Feature kOmniboxLooseMaxLimitOnDedicatedRows;
+extern const base::Feature kOmniboxSuggestionButtonRow;
+extern const base::Feature kTabKeyCanEscapeOmniboxPopup;
 
 // Omnibox UI - these affect the UI or function of the location bar (not the
 // popup).