Adds option for JSON reader to allow invalid utf characters

base/json/json_parser.cc

Index: base/json/json_parser.cc
diff --git a/base/json/json_parser.cc b/base/json/json_parser.cc
index 9ce6a2c1e73fa7105402ee84580eb564bcddd700..cd427da9ea2537fa86c103452d72505731ab6129 100644
--- a/base/json/json_parser.cc
+++ b/base/json/json_parser.cc
@@ -188,6 +188,9 @@ class StackMarker {
 
 }  // namespace
 
+// This is U+FFFD.
+const char kUnicodeReplacementString[] = "\xEF\xBF\xBD";
+
 JSONParser::JSONParser(int options)
     : options_(options),
       start_pos_(nullptr),
@@ -626,11 +629,18 @@ bool JSONParser::ConsumeStringRaw(StringBuilder* out) {
   int32_t next_char = 0;
 
   while (CanConsume(1)) {
+    int start_index = index_;
     pos_ = start_pos_ + index_;  // CBU8_NEXT is postcrement.
     CBU8_NEXT(start_pos_, index_, length, next_char);
     if (next_char < 0 || !IsValidCharacter(next_char)) {
-      ReportError(JSONReader::JSON_UNSUPPORTED_ENCODING, 1);
-      return false;
+      if ((options_ & JSON_REPLACE_INVALID_CHARACTERS) == 0) {
+        ReportError(JSONReader::JSON_UNSUPPORTED_ENCODING, 1);
+        return false;
+      }
+      CBU8_NEXT(start_pos_, start_index, length, next_char);
+      string.Convert();
+      string.AppendString(kUnicodeReplacementString);
+      continue;
     }
 
     if (next_char == '"') {