Disallow mixing of Canadian Syllabary and [a-z]

components/url_formatter/url_formatter.cc

Index: components/url_formatter/url_formatter.cc
diff --git a/components/url_formatter/url_formatter.cc b/components/url_formatter/url_formatter.cc
index d54b67913ce76d400907266963475bae6920cdd9..8f9bfe39018cb4bf6bb4174366d76c6e11e14ed7 100644
--- a/components/url_formatter/url_formatter.cc
+++ b/components/url_formatter/url_formatter.cc
@@ -415,6 +415,7 @@ bool IDNSpoofChecker::Check(base::StringPiece16 label, bool is_tld_ascii) {
     // - Disallow U+0585 (Armenian Small Letter Oh) and U+0581 (Armenian Small
     //   Letter Co) to be next to Latin.
     // - Disallow Latin 'o' and 'g' next to Armenian.
+    // - Disalow mixing of Latin and Canadian Syllabary.
     dangerous_pattern = new icu::RegexMatcher(
         icu::UnicodeString(
             "[^\\p{scx=kana}\\p{scx=hira}\\p{scx=hani}]"
@@ -428,7 +429,8 @@ bool IDNSpoofChecker::Check(base::StringPiece16 label, bool is_tld_ascii) {
             "^[\\u0585\\u0581]+[a-z]|[a-z][\\u0585\\u0581]+$|"
             "[a-z][\\u0585\\u0581]+[a-z]|"
             "^[og]+[\\p{scx=armn}]|[\\p{scx=armn}][og]+$|"
-            "[\\p{scx=armn}][og]+[\\p{scx=armn}]",
+            "[\\p{scx=armn}][og]+[\\p{scx=armn}]|"
+            "[\\p{sc=cans}].*[a-z]|[a-z].*[\\p{sc=cans}]",
             -1, US_INV),
         0, status);
     tls_index.Set(dangerous_pattern);