Pass Manifest JSON paser error line and column number to console.

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 322927548adfec6878aaf6749bcb9528c0bafa85..fbd4da45fb1405b71da3d5e4bd8387480038187c 100644
--- a/base/json/json_parser.cc
+++ b/base/json/json_parser.cc
@@ -275,6 +275,14 @@ std::string JSONParser::GetErrorMessage() const {
       JSONReader::ErrorCodeToString(error_code_));
 }
 
+int JSONParser::error_line() const {
+  return error_line_;
+}
+
+int JSONParser::error_column() const {
+  return error_column_;
+}
+
 // StringBuilder ///////////////////////////////////////////////////////////////
 
 JSONParser::StringBuilder::StringBuilder()