Fast path for google_util::IsValidHostName

components/google/core/browser/google_util.cc

Index: components/google/core/browser/google_util.cc
diff --git a/components/google/core/browser/google_util.cc b/components/google/core/browser/google_util.cc
index a6654c9f28701ad6a10781ed527a4b6f12e486db..f3e8fd432b8e35afac9835c7e8727b6ff0ac2f27 100644
--- a/components/google/core/browser/google_util.cc
+++ b/components/google/core/browser/google_util.cc
@@ -50,6 +50,9 @@ bool IsPathHomePageBase(base::StringPiece path) {
 bool IsValidHostName(base::StringPiece host,
                      base::StringPiece domain_in_lower_case,
                      SubdomainPermission subdomain_permission) {
+  // Fast path to avoid searching the registry set.
+  if (host.find(domain_in_lower_case) == base::StringPiece::npos)
+    return false;
   size_t tld_length =
       net::registry_controlled_domains::GetCanonicalHostRegistryLength(
           host, net::registry_controlled_domains::EXCLUDE_UNKNOWN_REGISTRIES,