Support receiving GrowableObjectArray on native ports

runtime/vm/dart_api_message.cc

Index: runtime/vm/dart_api_message.cc
diff --git a/runtime/vm/dart_api_message.cc b/runtime/vm/dart_api_message.cc
index e7fb7cc3f95d8a693a95aea6a0f7ad3741a4c4f7..9aa24a21c5f3cc9ee49a7171766ec556f9ad5f1d 100644
--- a/runtime/vm/dart_api_message.cc
+++ b/runtime/vm/dart_api_message.cc
@@ -206,6 +206,24 @@ Dart_CObject* ApiMessageReader::ReadInlinedObject(intptr_t object_id) {
       value->value.as_array.values[i] = ReadObjectRef();
     }
     return value;
+  } else if (class_id == kGrowableObjectArrayCid) {
+    // A GrowableObjectArray is serialized as its length followed by its backing
+    // store. The backing store is an array with a length which might be longer
+    // than the length of the GrowableObjectArray.
+    intptr_t len = ReadSmiValue();
+    Dart_CObject* value = GetBackRef(object_id);
+    ASSERT(value == NULL);
+    // Allocate an empty array for the GrowableObjectArray which will be updated
+    // to point to the content when the backing store has been deserialized.
+    value = AllocateDartCObjectArray(0);
+    AddBackRef(object_id, value, kIsDeserialized);
+    // Read the content of the GrowableObjectArray.
+    Dart_CObject* content = ReadObjectImpl();
+    ASSERT(content->type == Dart_CObject::kArray);
+    // Make the empty array allocated point to the backing store content.
+    value->value.as_array.length = len;
+    value->value.as_array.values = content->value.as_array.values;
+    return value;
   }
 
   return ReadInternalVMObject(class_id, object_id);