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

base/json/json_reader.h

Index: base/json/json_reader.h
diff --git a/base/json/json_reader.h b/base/json/json_reader.h
index 45783b0cf81004f9f6796b8ba9d8438cdef19d9d..c6bcb528e3b1ad0cd44a6b8559065fe56db367f3 100644
--- a/base/json/json_reader.h
+++ b/base/json/json_reader.h
@@ -107,7 +107,9 @@ class BASE_EXPORT JSONReader {
   static scoped_ptr<Value> ReadAndReturnError(const StringPiece& json,
                                               int options,  // JSONParserOptions
                                               int* error_code_out,
-                                              std::string* error_msg_out);
+                                              std::string* error_msg_out,
+                                              int* error_line_out = nullptr,
+                                              int* error_column_out = nullptr);

[Nico, 2016/01/13 20:50:39]

That'd also help here...

 
   // Converts a JSON parse error code into a human readable message.
   // Returns an empty string if error_code is JSON_NO_ERROR.