Add chrome://flags for update menu item

chrome/android/java/src/org/chromium/chrome/browser/omaha/UpdateMenuItemHelper.java

Index: chrome/android/java/src/org/chromium/chrome/browser/omaha/UpdateMenuItemHelper.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/omaha/UpdateMenuItemHelper.java b/chrome/android/java/src/org/chromium/chrome/browser/omaha/UpdateMenuItemHelper.java
index 999689752532cfa22b2d76310893de515559930d..01f8ca05b1ce4c56d088e9c3653ed255fb8fb380 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/omaha/UpdateMenuItemHelper.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/omaha/UpdateMenuItemHelper.java
@@ -158,7 +158,7 @@ public class UpdateMenuItemHelper {
      * @return The string to use for summary text or the empty string if no summary should be shown.
      */
     public String getMenuItemSummaryText(Context context) {
-        if (!getBooleanParam(SHOW_SUMMARY)) {
+        if (!getBooleanParam(SHOW_SUMMARY) && !getBooleanParam(CUSTOM_SUMMARY)) {
             return "";
         }