Add feature to control showing suggestion summaries.

chrome/browser/android/chrome_feature_list.cc

Index: chrome/browser/android/chrome_feature_list.cc
diff --git a/chrome/browser/android/chrome_feature_list.cc b/chrome/browser/android/chrome_feature_list.cc
index 0c2a753eb0c43034fd3d657080b76170d3b75990..caac47d0d09f776328730f98d94897fdbf187327 100644
--- a/chrome/browser/android/chrome_feature_list.cc
+++ b/chrome/browser/android/chrome_feature_list.cc
@@ -53,6 +53,7 @@ const base::Feature* kFeaturesExposedToJava[] = {
     &kChromeHomeFeature,
     &kChromeHomeExpandButton,
     &kContentSuggestionsSettings,
+    &kContentSuggestionsShowSummary,
     &kContextualSearchSingleActions,
     &kContextualSearchUrlActions,
     &kCustomContextMenu,
@@ -132,6 +133,9 @@ const base::Feature kChromeHomeExpandButton{"ChromeHomeExpandButton",
 const base::Feature kContentSuggestionsSettings{
     "ContentSuggestionsSettings", base::FEATURE_DISABLED_BY_DEFAULT};
 
+const base::Feature kContentSuggestionsShowSummary{
+    "ContentSuggestionsShowSummary", base::FEATURE_ENABLED_BY_DEFAULT};
+
 const base::Feature kContextualSearchSingleActions{
     "ContextualSearchSingleActions", base::FEATURE_ENABLED_BY_DEFAULT};