[dart:io] Add new functions to file_unsupported.cc.

runtime/bin/file_unsupported.cc

Index: runtime/bin/file_unsupported.cc
diff --git a/runtime/bin/file_unsupported.cc b/runtime/bin/file_unsupported.cc
index 88e85c6476f4742a73f0a05fd07f4a9f5a885ae3..9196c22b0710fc205359fcd8e64093997a443a44 100644
--- a/runtime/bin/file_unsupported.cc
+++ b/runtime/bin/file_unsupported.cc
@@ -108,6 +108,24 @@ void FUNCTION_NAME(File_LastModified)(Dart_NativeArguments args) {
 }
 
 
+void FUNCTION_NAME(File_LastAccessed)(Dart_NativeArguments args) {
+  Dart_ThrowException(
+      DartUtils::NewInternalError("File is not supported on this platform"));
+}
+
+
+void FUNCTION_NAME(File_SetLastModified)(Dart_NativeArguments args) {
+  Dart_ThrowException(
+      DartUtils::NewInternalError("File is not supported on this platform"));
+}
+
+
+void FUNCTION_NAME(File_SetLastAccessed)(Dart_NativeArguments args) {
+  Dart_ThrowException(
+      DartUtils::NewInternalError("File is not supported on this platform"));
+}
+
+
 void FUNCTION_NAME(File_Flush)(Dart_NativeArguments args) {
   Dart_ThrowException(
       DartUtils::NewInternalError("File is not supported on this platform"));