Mark file system event tests as slow.

Restore timeout for windows-arm64, which did not get faster.

Change-Id: I9f032c25fc69454929348f0589d35200a4728142
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/364625
Commit-Queue: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Siva Annamalai <asiva@google.com>

pkg/test_runner/lib/src/runtime_configuration.dart

@@ -356,8 +356,9 @@ class DartVmRuntimeConfiguration extends RuntimeConfiguration {
     if (arch == Architecture.ia32) {
       multiplier *= 2;
     }
-    if (arch == Architecture.x64 && system == System.mac) {
-      multiplier *= 2; // Older, slower machines.
+    if ((arch == Architecture.x64 && system == System.mac) ||
+        (arch == Architecture.arm64 && system == System.win)) {
+      multiplier *= 2; // Slower machines.
     }
 
     if (mode.isDebug) {

tests/co19/co19-runtime.status

@@ -2,8 +2,10 @@
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
+LibTest/io/FileSystemModifyEvent/*: Pass, Slow
+LibTest/io/FileSystemMoveEvent/*: Pass, Slow
+
 [ $system == windows ]
-LibTest/io/FileSystemModifyEvent/contentChanged_A01_t01: Pass, Slow
 LibTest/io/ProcessResult/exitCode_A01_t02: Skip # Issue 32138
 LibTest/io/Stdin/readByteSync_A01_t01: Skip # Issue 32138
 LibTest/io/Stdin/readByteSync_A01_t02: Skip # Issue 32138