Add flag for single click autofill

components/autofill/core/common/autofill_switches.cc

 // Copyright 2013 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 "components/autofill/core/common/autofill_switches.h"
 
 namespace autofill {
 namespace switches {
 
 // Disables password generation when we detect that the user is going through
 // account creation.
 const char kDisablePasswordGeneration[]     = "disable-password-generation";
 
+// The "disable" flag for kEnableSingleClickAutofill.
+const char kDisableSingleClickAutofill[]    = "disable-single-click-autofill";
+
 // Local heuristics override server predictions for name types.
 const char kDisambiguateAutofillServerNameTypes[] =
     "disambiguate-autofill-server-name-types";
 
 // Enables password generation when we detect that the user is going through
 // account creation.
 const char kEnablePasswordGeneration[]      = "enable-password-generation";
 
+// Enables/disables suggestions without typing anything (on first click).
+const char kEnableSingleClickAutofill[]     = "enable-single-click-autofill";
+
 // Ignores autocomplete="off" for Autofill data (profiles + credit cards).
 const char kIgnoreAutocompleteOffForAutofill[] =
     "ignore-autocomplete-off-autofill";
 
 // Removes the requirement that we recieved a ping from the autofill servers
 // and that the user doesn't have the given form blacklisted. Used in testing.
 const char kLocalHeuristicsOnlyForPasswordGeneration[] =
     "local-heuristics-only-for-password-generation";
 
 // The "disable" flag for kIgnoreAutocompleteOffForAutofill.
@@ skipping 12 matching lines @@
 
 // Service URL for Online Wallet service. Used as the base url for Online Wallet
 // API calls.
 const char kWalletServiceUrl[]              = "wallet-service-url";
 
 // Use the sandbox Online Wallet service URL (for developer testing).
 const char kWalletServiceUseSandbox[]       = "wallet-service-use-sandbox";
 
 }  // namespace switches
 }  // namespace autofill