🏠 Add expand button and flag to enable it

chrome/android/java/src/org/chromium/chrome/browser/util/FeatureUtilities.java

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.util;
 
 import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
 import android.content.Context;
 import android.content.Intent;
@@ skipping 247 matching lines @@
      * @return Whether or not chrome should attach the toolbar to the bottom of the screen.
      */
     public static boolean isChromeHomeEnabled() {
         if (sChromeHomeEnabled == null) {
             sChromeHomeEnabled = ChromePreferenceManager.getInstance().isChromeHomeEnabled();
         }
 
         return sChromeHomeEnabled;
     }
 
+    /**
+     * @return Whether or not the expand button for Chrome Home is enabled.
+     */
+    public static boolean isChromeHomeExpandButtonEnabled() {
+        return ChromeFeatureList.isEnabled(ChromeFeatureList.CHROME_HOME_EXPAND_BUTTON);
+    }
+
     private static native void nativeSetCustomTabVisible(boolean visible);
     private static native void nativeSetIsInMultiWindowMode(boolean isInMultiWindowMode);
 }