Add API function Dart_ZoneAllocate

runtime/vm/dart_api_impl.cc

Index: runtime/vm/dart_api_impl.cc
diff --git a/runtime/vm/dart_api_impl.cc b/runtime/vm/dart_api_impl.cc
index ebffdb406f0aadc3c20661f76c16a93f20216a42..4b7ac9bdcca82813377d59c876ca0596c35cbd16 100644
--- a/runtime/vm/dart_api_impl.cc
+++ b/runtime/vm/dart_api_impl.cc
@@ -2522,4 +2522,21 @@ DART_EXPORT void Dart_GetPprofSymbolInfo(void** buffer, int* buffer_size) {
   }
 }
 
+
+DART_EXPORT uint8_t* Dart_ZoneAllocate(intptr_t size) {
+  ApiZone* zone;
+  Isolate* isolate = Isolate::Current();
+  if (isolate != NULL) {
+    ApiState* state = isolate->api_state();
+    if (state == NULL) return NULL;
+    ApiLocalScope* scope = state->top_scope();
+    zone = &scope->zone();
+  } else {
+    ApiNativeScope* scope = ApiNativeScope::Current();
+    if (scope == NULL) return NULL;
+    zone = &scope->zone();
+  }
+  return reinterpret_cast<uint8_t*>(zone->Allocate(size));
+}
+
 }  // namespace dart