[Autofill] Add Chrome flag that annotates web forms with form and field signatures

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 "build/build_config.h"
 #include "components/autofill/core/common/autofill_switches.h"
 
 namespace autofill {
 namespace switches {
 
@@ skipping 38 matching lines @@
     "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";
 
 // Annotates forms with Autofill field type predictions.
 const char kShowAutofillTypePredictions[]   = "show-autofill-type-predictions";
 
+// Annotates forms and fields with Autofill signatures.
+const char kShowAutofillSignatures[] = "show-autofill-signatures";
+
 // Use the sandbox Online Wallet service URL (for developer testing).
 const char kWalletServiceUseSandbox[]       = "wallet-service-use-sandbox";
 
 #if defined(OS_ANDROID)
 // Disables showing suggestions in a keyboard accessory view.
 const char kDisableAccessorySuggestionView[] =
     "disable-autofill-keyboard-accessory-view";
 
 // Enables showing suggestions in a keyboard accessory view.
 const char kEnableAccessorySuggestionView[] =
     "enable-autofill-keyboard-accessory-view";
 #endif  // defined(OS_ANDROID)
 
 }  // namespace switches
 }  // namespace autofill