Add support for recording a log file during tests

pkg/analysis_server/test/integration/support/integration_tests.dart

Index: pkg/analysis_server/test/integration/support/integration_tests.dart
diff --git a/pkg/analysis_server/test/integration/support/integration_tests.dart b/pkg/analysis_server/test/integration/support/integration_tests.dart
index e5db976e26c2db822408506ae0ab79f9814755e6..d002217bb9cfa6d4669d6d66b83567f6df419a88 100644
--- a/pkg/analysis_server/test/integration/support/integration_tests.dart
+++ b/pkg/analysis_server/test/integration/support/integration_tests.dart
@@ -649,6 +649,7 @@ class Server {
   Future start({
     bool checked: true,
     int diagnosticPort,
+    String instrumentationLogFile,
     bool profileServer: false,
     String sdkPath,
     int servicesPort,
@@ -696,6 +697,9 @@ class Server {
       arguments.add('--port');
       arguments.add(diagnosticPort.toString());
     }
+    if (instrumentationLogFile != null) {
+      arguments.add('--instrumentation-log-file=$instrumentationLogFile');
+    }
     if (sdkPath != null) {
       arguments.add('--sdk=$sdkPath');
     }