* Implement json decoding for Any message.
type url may not appear as the first value in json. As a result,
other data cannot be resolved before resolving type url. To solve that,
this change caches the start and end position of unparsed values and
resolve them in end_any_object when type url has been resolved.
* Handle Any in switch
* Update json parser size
* Fix comments
* Sync upstream
* Add dependency on upb_pb for upb_json
* Debug failed test
* Fix cmake
* Update test generated files
* Remove debug tests
* Fix json ignore unknown
Previously, there were several problems with ignoring unknown in json.
1) After finding a field is unknown, the parser's state is not changed. Thus, there is no way to distinguish whether the parser is dealing with an unknown field or it's just a top level message.
2) Several method didn't respect unknown field, e.g., start_object, end_bool, start_array.
* Update json parser size
* Update json parser size
* Fix json encoding for wrappers, ListValue, Struct and Value.
* Add well_known_type field in upb_msgdef to specify type of well known messages.
* Remove comma at end of enum definition.
* Group number wrappers
* Fix comments
* Refactoring to use is_wellknown_{msg/field}
The reason for typecasting size_t to unint32_t is that size_t is 8 bytes and uint32_t is only 4 bytes.
If not typecasted Memcpy fails to copy the *correct* four bytes in big endian platforms.
Joshua Haberman
Bo Yang
Paul Yang
Sakala Venkata Krishna Rohit