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

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 1c9ccbeec1efe3ab70c3400aa26021323ea69fad..8b60cf43ad96606b3b04d278f58f8e2db7294822 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -1298,6 +1298,14 @@ const Experiment kExperiments[] = {
                               switches::kDisableSuggestionsService)
   },
   {
+     "enable-suggestions-with-substring-match",
+     IDS_FLAGS_ENABLE_SUGGESTIONS_WITH_SUB_STRING_MATCH_NAME,
+     IDS_FLAGS_ENABLE_SUGGESTIONS_WITH_SUB_STRING_MATCH_DESCRIPTION,
+     kOsAll,
+     SINGLE_VALUE_TYPE(
+             autofill::switches::kEnableSuggestionsWithSubstringMatch)
+  },
+  {
     "enable-supervised-user-managed-bookmarks-folder",
     IDS_FLAGS_ENABLE_SUPERVISED_USER_MANAGED_BOOKMARKS_FOLDER_NAME,
     IDS_FLAGS_ENABLE_SUPERVISED_USER_MANAGED_BOOKMARKS_FOLDER_DESCRIPTION,