Switch use-zoom-for-dsf flag to use tri-value flags

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 505 matching lines @@
     {IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", ""},
     {IDS_FLAGS_ENABLE_OFFLINE_PAGES_AS_BOOKMARKS,
      switches::kEnableOfflinePagesAsBookmarks, ""},
     {IDS_FLAGS_ENABLE_OFFLINE_PAGES_AS_SAVED_PAGES,
      switches::kEnableOfflinePagesAsSavedPages, ""},
     {IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED, switches::kDisableOfflinePages,
      ""},
 };
 #endif  // defined(OS_ANDROID)
 
+const FeatureEntry::Choice kEnableUseZoomForDSFChoices[] = {
+  { IDS_FLAGS_ENABLE_USE_ZOOM_FOR_DSF_CHOICE_DEFAULT, "", ""},
+  { IDS_FLAGS_ENABLE_USE_ZOOM_FOR_DSF_CHOICE_ENABLED,
+    switches::kEnableUseZoomForDSF, "true" },
+  { IDS_FLAGS_ENABLE_USE_ZOOM_FOR_DSF_CHOICE_DISABLED,
+    switches::kEnableUseZoomForDSF, "false" },
+};
+
 // RECORDING USER METRICS FOR FLAGS:
 // -----------------------------------------------------------------------------
 // The first line of the entry is the internal name. If you'd like to gather
 // statistics about the usage of your flag, you should append a marker comment
 // to the end of the feature name, like so:
 //   "my-special-feature",  // FLAGS:RECORD_UMA
 //
 // After doing that, run
 //   tools/metrics/actions/extract_actions.py
 // to add the metric to actions.xml (which will enable UMA to record your
@@ skipping 1171 matching lines @@
      MULTI_VALUE_TYPE(kMarkNonSecureAsChoices)},
     {"enable-site-per-process",
      IDS_FLAGS_SITE_PER_PROCESS_NAME,
      IDS_FLAGS_SITE_PER_PROCESS_DESCRIPTION,
      kOsAll,
      SINGLE_VALUE_TYPE(switches::kSitePerProcess)},
     {"enable-use-zoom-for-dsf",
      IDS_FLAGS_ENABLE_USE_ZOOM_FOR_DSF_NAME,
      IDS_FLAGS_ENABLE_USE_ZOOM_FOR_DSF_DESCRIPTION,
      kOsDesktop,
-     SINGLE_VALUE_TYPE(switches::kEnableUseZoomForDSF)},
+     MULTI_VALUE_TYPE(kEnableUseZoomForDSFChoices)},
 #if defined(OS_MACOSX)
     {"enable-harfbuzz-rendertext",
      IDS_FLAGS_HARFBUZZ_RENDERTEXT_NAME,
      IDS_FLAGS_HARFBUZZ_RENDERTEXT_DESCRIPTION,
      kOsMac,
      SINGLE_VALUE_TYPE(switches::kEnableHarfBuzzRenderText)},
 #endif  // defined(OS_MACOSX)
 #if defined(OS_CHROMEOS)
     {"disable-timezone-tracking",
      IDS_FLAGS_RESOLVE_TIMEZONE_BY_GEOLOCATION_NAME,
@@ skipping 617 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags