Disables Vasco suggestions when zero-prefix suggestions in NTP are enabled

This is a follow up to crrev.com/c/1809966. Disables Vasco chips in the NTP
when zero-prefix suggestions are enabled using omnibox::kOnFocusSuggestions

Bug: 996516
Change-Id: I8ee718d710fd150eabf4f2943cdc9b489a76b33a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1856861Reviewed-by: Dan Beam <dbeam@chromium.org>
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705222}

chrome/browser/search/search_suggest/search_suggest_service.cc

@@ -15,6 +15,7 @@
 #include "chrome/browser/search/search.h"
 #include "chrome/browser/search/search_suggest/search_suggest_loader.h"
 #include "chrome/common/pref_names.h"
+#include "components/omnibox/browser/omnibox_field_trial.h"
 #include "components/omnibox/common/omnibox_features.h"
 #include "components/prefs/scoped_user_pref_update.h"
 #include "components/signin/public/identity_manager/accounts_in_cookie_jar_info.h"
@@ -97,10 +98,16 @@ class SearchSuggestService::SigninObserver
 
 // static
 bool SearchSuggestService::IsEnabled() {
-  // Search suggestions should be disabled when on-focus zero-prefix suggestions
-  // are displaying in the NTP.
   return !base::FeatureList::IsEnabled(omnibox::kZeroSuggestionsOnNTP) &&
-         !base::FeatureList::IsEnabled(omnibox::kZeroSuggestionsOnNTPRealbox);
+         !base::FeatureList::IsEnabled(omnibox::kZeroSuggestionsOnNTPRealbox) &&
+         !(base::FeatureList::IsEnabled(omnibox::kOnFocusSuggestions) &&
+           (!OmniboxFieldTrial::GetZeroSuggestVariants(
+                 metrics::OmniboxEventProto::NTP_REALBOX)
+                 .empty() ||
+            !OmniboxFieldTrial::GetZeroSuggestVariants(
+                 metrics::OmniboxEventProto::
+                     INSTANT_NTP_WITH_OMNIBOX_AS_STARTING_FOCUS)
+                 .empty()));
 }
 
 SearchSuggestService::SearchSuggestService(

chrome/browser/search/search_suggest/search_suggest_service.h

@@ -28,6 +28,11 @@ class IdentityManager;
 // user signs in or out, the cached value is cleared.
 class SearchSuggestService : public KeyedService {
  public:
+  // Search suggestions should be disabled when on-focus zero-prefix suggestions
+  // are displaying in the NTP. Returns false if omnibox::kZeroSuggestionsOnNTP
+  // or omnibox::kZeroSuggestionsOnNTPRealboxkNtpRealbox are enabled; or
+  // omnibox::kOnFocusSuggestions is enabled and configured to show suggestions
+  // of some type in the NTP Omnibox or Realbox.
   static bool IsEnabled();
 
   SearchSuggestService(Profile* profile,