[SplitSettings] Add feature flag to chrome://flags

BUG=950007

Change-Id: I16148bf58dd006305e375b5ae8ec5aa4551eba80
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1636032
Reviewed-by: James Cook <[email protected]>
Commit-Queue: May Lippert <[email protected]>
Cr-Commit-Position: refs/heads/master@{#664468}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index b7ec08a1..e9b0679 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -3829,6 +3829,12 @@
      FEATURE_VALUE_TYPE(chromeos::features::kSmartDimModelV3)},
 #endif  // defined(OS_CHROMEOS)
 
+#if defined(OS_CHROMEOS)
+    {"split-settings", flag_descriptions::kSplitSettingsName,
+     flag_descriptions::kSplitSettingsDescription, kOsCrOS,
+     FEATURE_VALUE_TYPE(chromeos::features::kSplitSettings)},
+#endif  // defined(OS_CHROMEOS)
+
     // NOTE: Adding a new flag requires adding a corresponding entry to enum
     // "LoginCustomFlags" in tools/metrics/histograms/enums.xml. See "Flag
     // Histograms" in tools/metrics/histograms/README.md (run the