[iOS] Add omnibox tail suggest flag

Add feature flag to enable tail search suggestions in the omnibox.

Bug: 1432628
Change-Id: I87624330c508ad39e2e902e3709dc17fee9c2915
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4418231
Commit-Queue: Christian Xu <[email protected]>
Commit-Queue: Robbie Gibson <[email protected]>
Reviewed-by: Robbie Gibson <[email protected]>
Auto-Submit: Christian Xu <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1129354}
diff --git a/ios/chrome/browser/flags/about_flags.mm b/ios/chrome/browser/flags/about_flags.mm
index f18d84f1..63e46891 100644
--- a/ios/chrome/browser/flags/about_flags.mm
+++ b/ios/chrome/browser/flags/about_flags.mm
@@ -1547,6 +1547,9 @@
      flag_descriptions::kOnlyAccessClipboardAsyncName,
      flag_descriptions::kOnlyAccessClipboardAsyncDescription, flags_ui::kOsIos,
      FEATURE_VALUE_TYPE(kOnlyAccessClipboardAsync)},
+    {"omnibox-tail-suggest", flag_descriptions::kOmniboxTailSuggestName,
+     flag_descriptions::kOmniboxTailSuggestDescription, flags_ui::kOsIos,
+     FEATURE_VALUE_TYPE(kOmniboxTailSuggest)},
 };
 
 bool SkipConditionalFeatureEntry(const flags_ui::FeatureEntry& entry) {