Mitigate spoofing attempt using Latin letters.

components/url_formatter/url_formatter_unittest.cc

Index: components/url_formatter/url_formatter_unittest.cc
diff --git a/components/url_formatter/url_formatter_unittest.cc b/components/url_formatter/url_formatter_unittest.cc
index a59b4b6b4d668585ce36df1064df0b2e0e118e92..90bb318dd1f83461eb4cd94d3651183f3d746b53 100644
--- a/components/url_formatter/url_formatter_unittest.cc
+++ b/components/url_formatter/url_formatter_unittest.cc
@@ -275,6 +275,22 @@ const IDNTestCase idn_cases[] = {
   // музей (museum in Russian) has characters without a Latin-look-alike.
   {"xn--e1adhj9a.com", L"\x043c\x0443\x0437\x0435\x0439.com", true},
 
+  // Similarity checks against the list of top domains. "digklmo68.com" and
+  // 'digklmo68.co.uk" are listed for unittest in the top domain list.
+  {"xn--igklmo68-nea32c.com", L"\x0111igklmo68.com", false}, // đigklmo68.com
+  {"www.xn--igklmo68-nea32c.com", L"www.\x0111igklmo68.com", false},
+  {"foo.bar.xn--igklmo68-nea32c.com", L"foo.bar.\x0111igklmo68.com", false},
+  {"xn--igklmo68-nea32c.co.uk", L"\x0111igklmo68.co.uk", false},
+  {"mail.xn--igklmo68-nea32c.co.uk", L"mail.\x0111igklmo68.co.uk", false},
+  {"xn--digklmo68-6jf.com", L"di\x0307gklmo68.com", false}, // di̇gklmo68.com
+  {"xn--digklmo68-7vf.com", L"dig\x0331klmo68.com", false}, // dig̱klmo68.com
+  {"xn--diglmo68-omb.com", L"dig\x0138lmo68.com", false}, // digĸlmo68.com
+  {"xn--digkmo68-9ob.com", L"digk\x0142mo68.com", false}, // digkłmo68.com
+  {"xn--digklo68-l89c.com", L"digkl\x1e43o68.com", false}, // digklṃo68.com
+  {"xn--digklm68-b5a.com", L"digklm\x00f8" L"68.com", false}, // digklmø68.com
+  {"xn--digklmo8-h7g.com", L"digklmo\x0431" L"8.com", false}, // digklmoб8.com
+  {"xn--digklmo6-7yr.com", L"digklmo6\x09ea.com", false}, // digklmo6৪.com
+
   // Mixed digits: the first two will also fail mixed script test
   // Latin + ASCII digit + Deva digit
   {"xn--asc1deva-j0q.co.in", L"asc1deva\x0967.co.in", false},
@@ -308,15 +324,15 @@ const IDNTestCase idn_cases[] = {
   // U+115F (Hangul Filler)
   {"xn--osd3820f24c.kr", L"\xac00\xb098\x115f.kr", false},
   {"www.xn--google-ho0coa.com", L"www.\x2039google\x203a.com", false},
-  // Latin small capital w
+  // Latin small capital w: hardᴡare.com
   {"xn--hardare-l41c.com", L"hard\x1d21" L"are.com", false},
   // Minus Sign(U+2212)
   {"xn--t9g238xc2a.jp", L"\x65e5\x2212\x672c.jp", false},
-  // Latin Small Letter Script G
+  // Latin Small Letter Script G: ɡɡ.com
   {"xn--0naa.com", L"\x0261\x0261.com", false},
   // Hangul Jamo(U+11xx)
   {"xn--0pdc3b.com", L"\x1102\x1103\x1110.com", false},
-  // degree sign
+  // degree sign: 36°c.com
   {"xn--36c-tfa.com", L"36\x00b0" L"c.com", false},
   // Pound sign
   {"xn--5free-9ga.com", L"5free\x00a8.com", false},
@@ -328,7 +344,7 @@ const IDNTestCase idn_cases[] = {
   {"xn--oogle-qmc.com", L"\x0261oogle.com", false},
   // Small Katakana Extension(U+31F1)
   {"xn--wlk.com", L"\x31f1.com", false},
-  // Heart symbol
+  // Heart symbol: ♥
   {"xn--ab-u0x.com", L"ab\x2665.com", false},
   // Emoji
   {"xn--vi8hiv.xyz", L"\U0001f355\U0001f4a9.xyz", false},
@@ -338,7 +354,7 @@ const IDNTestCase idn_cases[] = {
   {"xn--registered-25c.com", L"registered\x01c3.com", false},
   // ASCII '!' not allowed in IDN
   {"xn--!-257eu42c.kr", L"\xc548\xb155!.kr", false},
-  // 'GOOGLE' in IPA extension
+  // 'GOOGLE' in IPA extension: ɢᴏᴏɢʟᴇ
   {"xn--1naa7pn51hcbaa.com",
     L"\x0262\x1d0f\x1d0f\x0262\x029f\x1d07.com", false},
   // Padlock icon spoof.