arc: Prepare ArcAuthEndpoint flag for finch experiment.

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 2034 matching lines @@
     {"enable-emoji-handwriting-voice-on-ime-menu",
      IDS_FLAGS_ENABLE_EHV_INPUT_NAME, IDS_FLAGS_ENABLE_EHV_INPUT_DESCRIPTION,
      kOsCrOS, FEATURE_VALUE_TYPE(features::kEHVInputOnImeMenu)},
 #endif  // OS_CHROMEOS
     {"enable-gamepad-extensions", IDS_FLAGS_GAMEPAD_EXTENSIONS_NAME,
      IDS_FLAGS_GAMEPAD_EXTENSIONS_DESCRIPTION, kOsAll,
      FEATURE_VALUE_TYPE(features::kGamepadExtensions)},
 #if defined(OS_CHROMEOS)
     {"arc-use-auth-endpoint", IDS_FLAGS_ARC_USE_AUTH_ENDPOINT_NAME,
      IDS_FLAGS_ARC_USE_AUTH_ENDPOINT_DESCRIPTION, kOsCrOS,
-     SINGLE_VALUE_TYPE_AND_VALUE(
-         chromeos::switches::kArcUseAuthEndpoint,
-         "https://www-googleapis-staging.sandbox.google.com/oauth2/v4/"
-         "ExchangeToken")},
+     FEATURE_VALUE_TYPE(arc::kArcUseAuthEndpointFeature)},
     {"arc-boot-completed-broadcast", IDS_FLAGS_ARC_BOOT_COMPLETED,
      IDS_FLAGS_ARC_BOOT_COMPLETED_DESCRIPTION, kOsCrOS,
      FEATURE_VALUE_TYPE(arc::kBootCompletedBroadcastFeature)},
 #endif  // OS_CHROMEOS
     {"saveas-menu-text-experiment", IDS_FLAGS_SAVEAS_MENU_LABEL_EXPERIMENT_NAME,
      IDS_FLAGS_SAVEAS_MENU_LABEL_EXPERIMENT_DESCRIPTION, kOsDesktop,
      SINGLE_VALUE_TYPE(switches::kEnableSaveAsMenuLabelExperiment)},
     {"enable-generic-sensor", IDS_FLAGS_ENABLE_GENERIC_SENSOR_NAME,
      IDS_FLAGS_ENABLE_GENERIC_SENSOR_DESCRIPTION, kOsAll,
      FEATURE_VALUE_TYPE(features::kGenericSensor)},
@@ skipping 248 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags