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

base/json/json_parser.h

Index: base/json/json_parser.h
diff --git a/base/json/json_parser.h b/base/json/json_parser.h
index 57c07ba10aaf5f36c51c1ee51362e79e5658d6d2..6d6ca6fa282073bb8887155a889ad68929c29baa 100644
--- a/base/json/json_parser.h
+++ b/base/json/json_parser.h
@@ -58,6 +58,9 @@ class BASE_EXPORT JSONParser {
   // Returns the human-friendly error message.
   std::string GetErrorMessage() const;
 
+  int error_line() const;

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

Add a comment that explains when these return valid values, and what they return
when this is called at the wrong time

[horo, 2016/01/14 02:25:45]

Done.

+  int error_column() const;

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

There's so much error data here now -- does it make sense to have Parse return
some Result object, or should there be some JSonError struct?

[horo, 2016/01/14 02:25:45]

That sound good.
I will create another CL.

+
  private:
   enum Token {
     T_OBJECT_BEGIN,           // {