[Android History] Add a chrome://flags for the Android native history UI

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 2124 matching lines @@
 #endif
 #if defined(OS_ANDROID)
     {"enable-expanded-autofill-credit-card-popup",
      IDS_FLAGS_ENABLE_EXPANDED_AUTOFILL_CREDIT_CARD_POPUP_LAYOUT,
      IDS_FLAGS_ENABLE_EXPANDED_AUTOFILL_CREDIT_CARD_POPUP_LAYOUT_DESCRIPTION,
      kOsAndroid,
      FEATURE_WITH_VARIATIONS_VALUE_TYPE(
          autofill::kAutofillCreditCardPopupLayout,
          kAutofillCreditCardPopupLayoutFeatureVariations,
          "AutofillCreditCardPopupLayout")},
+     {"native-android-history-manager", IDS_NATIVE_ANDROID_HISTORY_MANAGER,
+      IDS_NATIVE_ANDROID_HISTORY_MANAGER_DESCRIPTION, kOsAndroid,
+      FEATURE_VALUE_TYPE(chrome::android::kNativeAndroidHistoryManager)},
 #endif  // OS_ANDROID
     {"enable-faster-location-reload", IDS_FLAGS_FASTER_LOCATION_RELOAD_NAME,
      IDS_FLAGS_FASTER_LOCATION_RELOAD_DESCRIPTION, kOsAll,
      FEATURE_VALUE_TYPE(features::kFasterLocationReload)}
 
     // NOTE: Adding new command-line switches requires adding corresponding
     // entries to enum "LoginCustomFlags" in histograms.xml. See note in
     // histograms.xml and don't forget to run AboutFlagsHistogramTest unit test.
 };
 
@@ skipping 193 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags