Recursively mark chained children for kotlin gen

Update mark_n2k to recursively mark all potential chained children for
native to Kotlin conversion. This ensures that all the necessary
ToKotlin functions are generated and fixes a downstream build error
where WGPUCompatibilityModeLimits is not currently being generated. This
was already done for mark_k2n.

This is a fix to unblock the Dawn into Google3 roll.

Change-Id: I7e76aa8494c789ad7a6571ea4b20552a5b11ab21
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/296756
Reviewed-by: Loko Kung <lokokung@google.com>
Commit-Queue: Natalie Chouinard <chouinard@google.com>

generator/dawn_json_generator.py

diff --git a/generator/dawn_json_generator.py b/generator/dawn_json_generator.py
index c6a8f6b..3a97702 100644
--- a/generator/dawn_json_generator.py
+++ b/generator/dawn_json_generator.py
@@ -879,6 +879,9 @@
             # Recursively mark all members of this structure.
             for member in typ.members:
                 mark_n2k(member.type)
+            # Recursively mark all potential chained children.
+            for child in chain_children.get(typ.name.get(), []):
+                mark_n2k(child)
 
     def mark_k2n(typ):
         # Only proceed if it's a structure and hasn't been marked yet to avoid infinite recursion.