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

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 08f08585f7a4b8c304c8893358bb1dd463941383..0d30cddb277a292a379feb50506f9b296ee63901 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -966,6 +966,30 @@ const FeatureEntry::Choice kEnableHeapProfilingChoices[] = {
      switches::kEnableHeapProfiling,
      switches::kEnableHeapProfilingTaskProfiler}};
 
+const FeatureEntry::FeatureParam kOmniboxUIMaxAutocompleteMatches4[] = {
+    {OmniboxFieldTrial::kUIMaxAutocompleteMatchesParam, "4"}};
+const FeatureEntry::FeatureParam kOmniboxUIMaxAutocompleteMatches6[] = {
+    {OmniboxFieldTrial::kUIMaxAutocompleteMatchesParam, "6"}};
+const FeatureEntry::FeatureParam kOmniboxUIMaxAutocompleteMatches8[] = {
+    {OmniboxFieldTrial::kUIMaxAutocompleteMatchesParam, "8"}};
+const FeatureEntry::FeatureParam kOmniboxUIMaxAutocompleteMatches10[] = {
+    {OmniboxFieldTrial::kUIMaxAutocompleteMatchesParam, "10"}};
+const FeatureEntry::FeatureParam kOmniboxUIMaxAutocompleteMatches12[] = {
+    {OmniboxFieldTrial::kUIMaxAutocompleteMatchesParam, "12"}};
+
+const FeatureEntry::FeatureVariation
+    kOmniboxUIMaxAutocompleteMatchesVariations[] = {
+        {"4 matches", kOmniboxUIMaxAutocompleteMatches4,
+         arraysize(kOmniboxUIMaxAutocompleteMatches4), nullptr},
+        {"6 matches", kOmniboxUIMaxAutocompleteMatches6,
+         arraysize(kOmniboxUIMaxAutocompleteMatches6), nullptr},
+        {"8 matches", kOmniboxUIMaxAutocompleteMatches8,
+         arraysize(kOmniboxUIMaxAutocompleteMatches8), nullptr},
+        {"10 matches", kOmniboxUIMaxAutocompleteMatches10,
+         arraysize(kOmniboxUIMaxAutocompleteMatches10), nullptr},
+        {"12 matches", kOmniboxUIMaxAutocompleteMatches12,
+         arraysize(kOmniboxUIMaxAutocompleteMatches12), nullptr}};
+
 const FeatureEntry::FeatureParam kOmniboxUIVerticalMargin4px[] = {
     {OmniboxFieldTrial::kUIVerticalMarginParam, "4"}};
 const FeatureEntry::FeatureParam kOmniboxUIVerticalMargin8px[] = {
@@ -2864,6 +2888,14 @@ const FeatureEntry kFeatureEntries[] = {
      SINGLE_VALUE_TYPE(switches::kShowCertLink)},
 #endif
 
+    {"omnibox-ui-max-autocomplete-matches",
+     flag_descriptions::kOmniboxUIMaxAutocompleteMatchesName,
+     flag_descriptions::kOmniboxUIMaxAutocompleteMatchesDescription, kOsDesktop,
+     FEATURE_WITH_PARAMS_VALUE_TYPE(
+         omnibox::kUIExperimentMaxAutocompleteMatches,
+         kOmniboxUIMaxAutocompleteMatchesVariations,
+         "OmniboxUIMaxAutocompleteVariations")},
+
     {"omnibox-ui-vertical-margin",
      flag_descriptions::kOmniboxUIVerticalMarginName,
      flag_descriptions::kOmniboxUIVerticalMarginDescription, kOsDesktop,