[mojo] Add pickling support for native-only structs

mojo/public/cpp/bindings/lib/bindings_internal.h

Index: mojo/public/cpp/bindings/lib/bindings_internal.h
diff --git a/mojo/public/cpp/bindings/lib/bindings_internal.h b/mojo/public/cpp/bindings/lib/bindings_internal.h
index 4c5917a1c61710b5640ad6b32e7024d825ed10fb..d55a397c6c192ce718fa47ebc9ee203762a48171 100644
--- a/mojo/public/cpp/bindings/lib/bindings_internal.h
+++ b/mojo/public/cpp/bindings/lib/bindings_internal.h
@@ -37,6 +37,12 @@ union StructPointer {
 };
 static_assert(sizeof(StructPointer<char>) == 8, "Bad_sizeof(StructPointer)");
 
+union NativePointer {

[yzshen1, 2015/12/15 21:20:26]

Please define it as an alias of ArrayPointer<uint8_t>.

[Ken Rockot(use gerrit already), 2015/12/15 23:31:07]

Actually I've decided to just get rid of this altogether. Instead the generator
just emits an ArrayPointer<uint8_t>, and I've added code so that array
validation params for native-only fields basically match those of string
validation. WDYT?

+  uint64_t offset;
+  Array_Data<uint8_t>* ptr;
+};
+static_assert(sizeof(NativePointer) == 8, "Bad_sizeof(NativePointer)");
+
 template <typename T>
 union ArrayPointer {
   uint64_t offset;