Treat U+2028 as a special code point when escaping for JSON.

base/json/string_escape_unittest.cc

Index: base/json/string_escape_unittest.cc
diff --git a/base/json/string_escape_unittest.cc b/base/json/string_escape_unittest.cc
index 100373fccd3ee7df36c8e11f89d06e04ab1734fa..f7ccafc9cb5f4ccd5704b6c0c5a429cc5b447b3b 100644
--- a/base/json/string_escape_unittest.cc
+++ b/base/json/string_escape_unittest.cc
@@ -21,6 +21,8 @@ TEST(JSONStringEscapeTest, EscapeUTF8) {
     {"b\x0f\x7f\xf0\xff!",  // \xf0\xff is not a valid UTF-8 unit.
         "b\\u000F\x7F\xEF\xBF\xBD\xEF\xBF\xBD!"},
     {"c<>d", "c\\u003C>d"},
+    {"Hello\xe2\x80\xa8world", "Hello\\u2028world"},
+    {"\xe2\x80\xa9purple", "\\u2029purple"},
   };
 
   for (size_t i = 0; i < arraysize(cases); ++i) {
@@ -79,6 +81,8 @@ TEST(JSONStringEscapeTest, EscapeUTF16) {
         "a\\b\\f\\n\\r\\t\\u000B\\u0001\\\\.\\\"z"},
     {L"b\x0f\x7f\xf0\xff!", "b\\u000F\x7F\xC3\xB0\xC3\xBF!"},
     {L"c<>d", "c\\u003C>d"},
+    {L"Hello\u2028world", "Hello\\u2028world"},
+    {L"\u2029purple", "\\u2029purple"},
   };
 
   for (size_t i = 0; i < arraysize(cases); ++i) {