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

components/autofill/core/common/autofill_switches.cc

Index: components/autofill/core/common/autofill_switches.cc
diff --git a/components/autofill/core/common/autofill_switches.cc b/components/autofill/core/common/autofill_switches.cc
index 00740e75d254d8157761ab63e5e74c1bd90f7b71..48a8829cae899f6119a933c6e666464ba1aebab6 100644
--- a/components/autofill/core/common/autofill_switches.cc
+++ b/components/autofill/core/common/autofill_switches.cc
@@ -47,6 +47,11 @@ const char kEnablePasswordSaveOnInPageNavigation[] =
 // Enables/disables suggestions without typing anything (on first click).
 const char kEnableSingleClickAutofill[]     = "enable-single-click-autofill";
 
+// Enables suggestions with sub-string matching instead of prefix
+// matching.
+const char kEnableSuggestionsWithSubStringMatch[] =
+    "enable-suggestions-with-sub-string-match";
+
 // Ignores autocomplete="off" for Autofill data (profiles + credit cards).
 const char kIgnoreAutocompleteOffForAutofill[] =
     "ignore-autocomplete-off-autofill";