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

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 5e1b0c916bf035506e3c13f96c1dd9ba20e32599..16eed81d2383bc52c67a5a0f9fb42afa01f8392d 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -6418,6 +6418,12 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_FLAGS_ENABLE_SAVE_PASSOWRD_ON_IN_PAGE_NAVIGATION_DESCRIPTION" desc="Description of the flag to enable showing of password save prompt on in-page navigations">
         Enable showing of the password prompt on in-page navigations. This allows for saving passwords on more pages but might sometimes trigger the prompt on unsuccessful login attempts.
       </message>
+      <message name="IDS_FLAGS_ENABLE_SUGGESTIONS_WITH_SUB_STRING_MATCH_NAME" desc="Name of the flag to enable substring matching for Autofill suggestions.">
+        Substring matching for Autofill suggestions.
+      </message>
+      <message name="IDS_FLAGS_ENABLE_SUGGESTIONS_WITH_SUB_STRING_MATCH_DESCRIPTION" desc="Description of the flag to enable substring matching for Autofill suggestions.">
+        Match Autofill suggestions based on substrings (token prefixes) rather than just prefixes.
+      </message>
       <message name="IDS_FLAGS_ENABLE_AFFILIATION_BASED_MATCHING_NAME" desc="Name of the flag to enable affiliation based matching, so that credentials stored for an Android application will also be considered matches for, and be filled into corresponding websites (so-called 'affiliated' websites).">
         Enable affiliation based matching in password manager.
       </message>