[TTS] Add a Feature and about:flag for Single Actions.

chrome/android/java/src/org/chromium/chrome/browser/ChromeFeatureList.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ChromeFeatureList.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ChromeFeatureList.java b/chrome/android/java/src/org/chromium/chrome/browser/ChromeFeatureList.java
index 8671c20d1f509a986c31cd0e811c038b20edb427..429caafac24335ec6f2df32d7ff353b421599ef4 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ChromeFeatureList.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ChromeFeatureList.java
@@ -29,9 +29,12 @@ public abstract class ChromeFeatureList {
         return nativeIsEnabled(featureName);
     }
 
+    // Alphabetical:
     public static final String ANDROID_PAY_INTEGRATION_V1 = "AndroidPayIntegrationV1";
     public static final String AUTOFILL_SCAN_CARDHOLDER_NAME = "AutofillScanCardholderName";
+    public static final String CCT_EXTERNAL_LINK_HANDLING = "CCTExternalLinkHandling";
     public static final String CHROME_HOME = "ChromeHome";
+    public static final String CONTEXTUAL_SEARCH_SINGLE_ACTIONS = "ContextualSearchSingleActions";
     /** Whether we show an important sites dialog in the "Clear Browsing Data" flow. */
     public static final String IMPORTANT_SITES_IN_CBD = "ImportantSitesInCBD";
     public static final String NTP_FAKE_OMNIBOX_TEXT = "NTPFakeOmniboxText";
@@ -41,7 +44,6 @@ public abstract class ChromeFeatureList {
     public static final String SCAN_CARDS_IN_WEB_PAYMENTS = "ScanCardsInWebPayments";
     public static final String TAB_REPARENTING = "TabReparenting";
     public static final String WEB_PAYMENTS = "WebPayments";
-    public static final String CCT_EXTERNAL_LINK_HANDLING = "CCTExternalLinkHandling";
 
     private static native boolean nativeIsEnabled(String featureName);
 }