[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 2084 matching lines @@
     {"enable-nostate-prefetch", IDS_FLAGS_NOSTATE_PREFETCH,
      IDS_FLAGS_NOSTATE_PREFETCH_DESCRIPTION, kOsAll,
      FEATURE_WITH_VARIATIONS_VALUE_TYPE(prerender::kNoStatePrefetchFeature,
                                         kNoStatePrefetchFeatureVariations,
                                         "NoStatePrefetchValidation")},
 #if defined(OS_CHROMEOS)
     {"cros-comp-updates", IDS_FLAGS_CROS_COMP_UPDATES_NAME,
      IDS_FLAGS_CROS_COMP_UPDATES_DESCRIPTION, kOsCrOS,
      FEATURE_VALUE_TYPE(features::kCrosCompUpdates)},
 #endif
+#if defined(OS_ANDROID)
+    {"native-android-history-manager", IDS_NATIVE_ANDROID_HISTORY_MANAGER,
+     IDS_NATIVE_ANDROID_HISTORY_MANAGER_DESCRIPTION, kOsAndroid,
+     FEATURE_VALUE_TYPE(chrome::android::kNativeAndroidHistoryManager)},
+#endif
 
     // 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.
 };
 
 class FlagsStateSingleton {
  public:
   FlagsStateSingleton()
       : flags_state_(kFeatureEntries, arraysize(kFeatureEntries)) {}
@@ skipping 189 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags