[mojo] Add Mojo bindings support for IPC::ParamTraits

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

Index: mojo/public/cpp/bindings/lib/validation_util.h
diff --git a/mojo/public/cpp/bindings/lib/validation_util.h b/mojo/public/cpp/bindings/lib/validation_util.h
index 41049c03c9880168d6755ad4d6311dae0fe8fa88..4b3f0ab1b44b02b3b929a811320940562a060b53 100644
--- a/mojo/public/cpp/bindings/lib/validation_util.h
+++ b/mojo/public/cpp/bindings/lib/validation_util.h
@@ -116,6 +116,19 @@ bool ValidateStruct(const StructPointer<T>& input,
 }
 
 template <typename T>
+bool ValidateNative(const NativePointer<T>& input,
+                    BoundsChecker* bounds_checker) {
+  if (!ValidateEncodedPointer(&input.offset)) {
+    ReportValidationError(VALIDATION_ERROR_ILLEGAL_POINTER);
+    return false;
+  }
+
+  // Native types perform validation during deserialization.
+  DecodePointerRaw(&input.offset);
+  return true;
+}
+
+template <typename T>
 bool ValidateInlinedUnion(const T& input, BoundsChecker* bounds_checker) {
   return T::Validate(&input, bounds_checker, true);
 }