🏠 Add expand button and flag to enable it

chrome/browser/flag_descriptions.cc

 // Copyright 2017 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.
 
 #include "chrome/browser/flag_descriptions.h"
 
 namespace flag_descriptions {
 
 //  Material Design version of chrome://bookmarks
 
@@ skipping 1944 matching lines @@
 #endif  // defined(OS_ANDROID)
 
 //  Chrome home flags
 
 #if defined(OS_ANDROID)
 
 const char kChromeHomeName[] = "Chrome Home";
 
 const char kChromeHomeDescription[] = "Enables Chrome Home on Android.";
 
+const char kChromeHomeExpandButtonName[] = "Chrome Home Expand Button";
+
+const char kChromeHomeExpandButtonDescription[] =
+    "Enables the expand button for Chrome Home.";
+
 #endif  // defined(OS_ANDROID)
 
 //  In-Product Help flags
 
 #if defined(OS_ANDROID)
 
 const char kEnableIphDemoMode[] = "In-Product Help Demo Mode";
 
 const char kEnableIphDemoModeDescription[] =
     "Enables In-Product Help demo mode on Android.";
@@ skipping 1061 matching lines @@
 
 const char kOmniboxDisplayTitleForCurrentUrlName[] =
     "Include title for the current URL in the omnibox";
 
 const char kOmniboxDisplayTitleForCurrentUrlDescription[] =
     "In the event that the omnibox provides suggestions on-focus, the URL of "
     "the current page is provided as the first suggestion without a title. "
     "Enabling this flag causes the title to be displayed.";
 
 }  // namespace flag_descriptions