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

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 59cb6683b283cb7ae3ea392177f618e7d31964b1..2947d4655d8375484645973a839dd2981915c5de 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -523,6 +523,14 @@ const FeatureEntry::Choice kEnableOfflinePagesChoices[] = {
 };
 #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
@@ -1714,7 +1722,7 @@ const FeatureEntry kFeatureEntries[] = {
      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,