[Autofill/Autocomplete Feature] Substring matching instead of prefix matching.

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 using device's camera to scan a new credit card when filling out a
@@ skipping 40 matching lines @@
 // account creation.
 const char kEnablePasswordGeneration[]      = "enable-password-generation";
 
 // Enable showing password save prompt on in-page navigations
 const char kEnablePasswordSaveOnInPageNavigation[] =
     "enable-password-save-in-page-navigation";
 
 // Enables/disables suggestions without typing anything (on first click).
 const char kEnableSingleClickAutofill[]     = "enable-single-click-autofill";
 
+// Enables suggestions with substring matching instead of prefix matching.
+const char kEnableSuggestionsWithSubstringMatch[] =
+    "enable-suggestions-with-substring-match";
+
 // 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";
 
 // Annotates forms with Autofill field type predictions.
 const char kShowAutofillTypePredictions[]   = "show-autofill-type-predictions";
 
 // Secure service URL for Online Wallet service. Used as the base url to escrow
 // credit card numbers.
 const char kWalletSecureServiceUrl[]        = "wallet-secure-service-url";
 
 // 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