[Password Manager] Setup experiment to restrict autofilling of sync credential

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 fa08f1d2cd3663591f6bf4c2a6da9cb340c7e496..2a87d8616eb5fe797fca41d61110696bf788da3d 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -503,6 +503,16 @@ const Experiment::Choice kEnableAVFoundationChoices[] = {
 };
 #endif
 
+const Experiment::Choice kAutofillSyncCredentialChoices[] = {
+  { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", ""},
+  { IDS_ALLOW_AUTOFILL_SYNC_CREDENTIAL,
+    password_manager::switches::kAllowAutofillSyncCredential, ""},
+  { IDS_DISALLOW_AUTOFILL_SYNC_CREDENTIAL_FOR_REAUTH,
+    password_manager::switches::kDisallowAutofillSyncCredentialForReauth, ""},
+  { IDS_DISALLOW_AUTOFILL_SYNC_CREDENTIAL,
+    password_manager::switches::kDisallowAutofillSyncCredential, ""},
+};
+
 // RECORDING USER METRICS FOR FLAGS:
 // -----------------------------------------------------------------------------
 // The first line of the experiment is the internal name. If you'd like to
@@ -1939,6 +1949,13 @@ const Experiment kExperiments[] = {
     kOsWin | kOsLinux | kOsCrOS,
     SINGLE_VALUE_TYPE(extensions::switches::kEnableExtensionActionRedesign)
   },
+  {
+    "autofill-sync-credential",
+    IDS_FLAGS_AUTOFILL_SYNC_CREDENTIAL_NAME,
+    IDS_FLAGS_AUTOFILL_SYNC_CREDENTIAL_DESCRIPTION,
+    kOsAll,
+    MULTI_VALUE_TYPE(kAutofillSyncCredentialChoices)
+  },
   // 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.