Implement json decoding for Any message. (#130)

* 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

1 files changed, 11 insertions, 1 deletions

diff --git a/upb/def.c b/upb/def.c
index 269a135..379be0b 100644
--- a/upb/def.c
+++ b/upb/def.c
@@ -371,7 +371,9 @@ static void assign_msg_wellknowntype(upb_msgdef *m) {
     m->well_known_type = UPB_WELLKNOWN_UNSPECIFIED;
     return;
   }
-  if (!strcmp(name, "google.protobuf.Duration")) {
+  if (!strcmp(name, "google.protobuf.Any")) {
+    m->well_known_type = UPB_WELLKNOWN_ANY;
+  } else if (!strcmp(name, "google.protobuf.Duration")) {
     m->well_known_type = UPB_WELLKNOWN_DURATION;
   } else if (!strcmp(name, "google.protobuf.Timestamp")) {
     m->well_known_type = UPB_WELLKNOWN_TIMESTAMP;
@@ -2146,6 +2148,14 @@ const upb_msgdef *upb_symtab_lookupmsg(const upb_symtab *s, const char *sym) {
   return def ? upb_dyncast_msgdef(def) : NULL;
 }
 
+const upb_msgdef *upb_symtab_lookupmsg2(const upb_symtab *s, const char *sym,
+                                        size_t len) {
+  upb_value v;
+  upb_def *def = upb_strtable_lookup2(&s->symtab, sym, len, &v) ?
+      upb_value_getptr(v) : NULL;
+  return def ? upb_dyncast_msgdef(def) : NULL;
+}
+
 const upb_enumdef *upb_symtab_lookupenum(const upb_symtab *s, const char *sym) {
   upb_value v;
   upb_def *def = upb_strtable_lookup(&s->symtab, sym, &v) ?