Add test.html to allowed test domains for webdriver test

Bug: b/162293447
Change-Id: I04ea807ba7944a9fb216b367910254556c2440c4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2355229Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: My Nguyen <myy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797947}

chrome/browser/chromeos/input_method/assistive_suggester.cc

@@ -43,6 +43,7 @@ const char* kAllowedDomainsForEmojiSuggester[] = {
 const char* kTestUrls[] = {
     "e14s-test",
     "simple_textarea.html",
+    "test.html",
 };
 
 // For some internal websites, we do not want to reveal their urls in plain