Switch Dart_Initialize to use a struct

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 aff9955d0f6066674e0b6dc52f2389bf321cc290..78ed41099bfd09302eb8b5ea4bde3bb24d534912 100644
--- a/runtime/vm/dart_api_impl.cc
+++ b/runtime/vm/dart_api_impl.cc
@@ -1142,37 +1142,29 @@ DART_EXPORT const char* Dart_VersionString() {
   return Version::String();
 }
 
-DART_EXPORT char* Dart_Initialize(
-    const uint8_t* vm_isolate_snapshot,
-    const uint8_t* instructions_snapshot,
-    const uint8_t* data_snapshot,
-    Dart_IsolateCreateCallback create,
-    Dart_IsolateInterruptCallback interrupt,
-    Dart_IsolateUnhandledExceptionCallback unhandled,
-    Dart_IsolateShutdownCallback shutdown,
-    Dart_ThreadExitCallback thread_exit,
-    Dart_FileOpenCallback file_open,
-    Dart_FileReadCallback file_read,
-    Dart_FileWriteCallback file_write,
-    Dart_FileCloseCallback file_close,
-    Dart_EntropySource entropy_source,
-    Dart_GetVMServiceAssetsArchive get_service_assets) {
-  if (interrupt != NULL) {
+DART_EXPORT char* Dart_Initialize(Dart_InitializeParams* params) {
+  if (params == NULL) {
     return strdup("Dart_Initialize: "
-                  "Setting of interrupt callback is not supported.");
+                  "Dart_InitializeParams is null.");
   }
-  if (unhandled != NULL) {
+
+  if (params->version != DART_INITIALIZE_PARAMS_CURRENT_VERSION) {
     return strdup("Dart_Initialize: "
-                  "Setting of unhandled exception callback is not supported.");
-  }
-  return Dart::InitOnce(vm_isolate_snapshot,
-                        instructions_snapshot,
-                        data_snapshot,
-                        create, shutdown,
-                        thread_exit,
-                        file_open, file_read, file_write, file_close,
-                        entropy_source,
-                        get_service_assets);
+                  "Invalid Dart_InitializeParams version.");
+  }
+
+  return Dart::InitOnce(params->vm_isolate_snapshot,
+                        params->instructions_snapshot,
+                        params->data_snapshot,
+                        params->create,
+                        params->shutdown,
+                        params->thread_exit,
+                        params->file_open,
+                        params->file_read,
+                        params->file_write,
+                        params->file_close,
+                        params->entropy_source,
+                        params->get_service_assets);
 }