🏠 Add expand button and flag to enable it

chrome/browser/about_flags.cc

 // Copyright (c) 2012 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/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 1622 matching lines @@
 #endif  // TOOLKIT_VIEWS
 #if defined(OS_ANDROID)
     {"reader-mode-heuristics", flag_descriptions::kReaderModeHeuristicsName,
      flag_descriptions::kReaderModeHeuristicsDescription, kOsAndroid,
      MULTI_VALUE_TYPE(kReaderModeHeuristicsChoices)},
 #endif  // OS_ANDROID
 #if defined(OS_ANDROID)
     {"enable-chrome-home", flag_descriptions::kChromeHomeName,
      flag_descriptions::kChromeHomeDescription, kOsAndroid,
      FEATURE_VALUE_TYPE(chrome::android::kChromeHomeFeature)},
+    {"enable-chrome-home-expand-button",
+     flag_descriptions::kChromeHomeExpandButtonName,
+     flag_descriptions::kChromeHomeExpandButtonDescription, kOsAndroid,
+     FEATURE_VALUE_TYPE(chrome::android::kChromeHomeExpandButton)},
 #endif  // OS_ANDROID
 #if defined(OS_ANDROID)
     {"enable-iph-demo-mode", flag_descriptions::kEnableIphDemoMode,
      flag_descriptions::kEnableIphDemoModeDescription, kOsAndroid,
      FEATURE_VALUE_TYPE(feature_engagement_tracker::kIPHDemoMode)},
 #endif  // OS_ANDROID
     {"num-raster-threads", flag_descriptions::kNumRasterThreadsName,
      flag_descriptions::kNumRasterThreadsDescription, kOsAll,
      MULTI_VALUE_TYPE(kNumRasterThreadsChoices)},
     {"enable-permission-action-reporting",
@@ skipping 1351 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags