Fix strong mode errors in dart:io.

runtime/bin/directory.cc

Index: runtime/bin/directory.cc
diff --git a/runtime/bin/directory.cc b/runtime/bin/directory.cc
index bb3173f5b63466d6d9bd5d90906edb41802f56b4..a9b2331e5bd0bec12017e40836e426cd0ada1cc5 100644
--- a/runtime/bin/directory.cc
+++ b/runtime/bin/directory.cc
@@ -115,28 +115,20 @@ void FUNCTION_NAME(Directory_Rename)(Dart_NativeArguments args) {
 }
 
 
-void FUNCTION_NAME(Directory_List)(Dart_NativeArguments args) {
-  Dart_Handle path = Dart_GetNativeArgument(args, 0);
-  Dart_Handle recursive = Dart_GetNativeArgument(args, 1);
-  // Create the list to hold the directory listing here, and pass it to the
-  // SyncDirectoryListing object, which adds elements to it.
-  Dart_Handle follow_links = Dart_GetNativeArgument(args, 2);
-  // Create the list to hold the directory listing here, and pass it to the
+void FUNCTION_NAME(Directory_FillWithDirectoryListing)(
+    Dart_NativeArguments args) {
+  // The list that we should fill.
+  Dart_Handle results = Dart_GetNativeArgument(args, 0);
+  Dart_Handle path = Dart_GetNativeArgument(args, 1);
+  Dart_Handle recursive = Dart_GetNativeArgument(args, 2);
+  Dart_Handle follow_links = Dart_GetNativeArgument(args, 3);
+  // Pass the list that should hold the directory listing to the
   // SyncDirectoryListing object, which adds elements to it.
-  Dart_Handle results =
-      Dart_New(DartUtils::GetDartType(DartUtils::kCoreLibURL, "List"),
-               Dart_Null(),
-               0,
-               NULL);
-  if (Dart_IsError(results)) {
-    Dart_PropagateError(results);
-  }
   SyncDirectoryListing sync_listing(results,
                                     DartUtils::GetStringValue(path),
                                     DartUtils::GetBooleanValue(recursive),
                                     DartUtils::GetBooleanValue(follow_links));
   Directory::List(&sync_listing);
-  Dart_SetReturnValue(args, results);
 }
 
 
@@ -407,7 +399,10 @@ bool SyncDirectoryListing::HandleDirectory(const char* dir_name) {
   Dart_Handle dir_name_dart = DartUtils::NewString(dir_name);
   Dart_Handle dir =
       Dart_New(directory_type_, Dart_Null(), 1, &dir_name_dart);
-  Dart_Invoke(results_, add_string_, 1, &dir);
+  Dart_Handle result = Dart_Invoke(results_, add_string_, 1, &dir);
+  if (Dart_IsError(result)) {
+    Dart_PropagateError(result);
+  }
   return true;
 }
 
@@ -416,7 +411,10 @@ bool SyncDirectoryListing::HandleLink(const char* link_name) {
   Dart_Handle link_name_dart = DartUtils::NewString(link_name);
   Dart_Handle link =
       Dart_New(link_type_, Dart_Null(), 1, &link_name_dart);
-  Dart_Invoke(results_, add_string_, 1, &link);
+  Dart_Handle result = Dart_Invoke(results_, add_string_, 1, &link);
+  if (Dart_IsError(result)) {
+    Dart_PropagateError(result);
+  }
   return true;
 }
 
@@ -425,7 +423,10 @@ bool SyncDirectoryListing::HandleFile(const char* file_name) {
   Dart_Handle file_name_dart = DartUtils::NewString(file_name);
   Dart_Handle file =
       Dart_New(file_type_, Dart_Null(), 1, &file_name_dart);
-  Dart_Invoke(results_, add_string_, 1, &file);
+  Dart_Handle result = Dart_Invoke(results_, add_string_, 1, &file);
+  if (Dart_IsError(result)) {
+    Dart_PropagateError(result);
+  }
   return true;
 }