Redo our benchmarks; add a benchmark/benchmarks.dart tool.

pkg/analysis_server/test/benchmarks_test.dart

+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// 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.=> defineTests();
+
+/// This tests the benchmarks in benchmark/benchmark.test, and ensures that our
+/// benchmarks can run.
+
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:path/path.dart' as path;
+import 'package:test/test.dart';
+
+void main() => defineTests();
+
+void defineTests() {
+  group('benchmarks', () {
+    final List<String> benchmarks = _listBenchmarks();
+
+    test('can list', () {
+      expect(benchmarks, isNotEmpty);
+    });
+
+    for (String benchmarkId in benchmarks) {
+      test(benchmarkId, () {
+        ProcessResult r = Process.runSync(
+          Platform.resolvedExecutable,
+          [
+            path.join('benchmark', 'benchmarks.dart'),
+            'run',
+            '--repeat=1',
+            '--quick',
+            benchmarkId
+          ],
+          workingDirectory: _serverSourcePath,
+        );
+        expect(r.exitCode, 0,
+            reason: 'exit: ${r.exitCode}\n${r.stdout}\n${r.stderr}');
+      });
+    }
+  });
+}
+
+List<String> _listBenchmarks() {
+  ProcessResult result = Process.runSync(
+    Platform.resolvedExecutable,
+    [path.join('benchmark', 'benchmarks.dart'), 'list', '--machine'],
+    workingDirectory: _serverSourcePath,
+  );
+  Map m = JSON.decode(result.stdout);
+  List benchmarks = m['benchmarks'];
+  return benchmarks.map((b) => b['id']).toList();
+}
+
+String get _serverSourcePath {
+  String script = Platform.script.toFilePath(windows: Platform.isWindows);
+  String pkgPath = path.normalize(path.join(path.dirname(script), '..', '..'));
+  return path.join(pkgPath, 'analysis_server');
+}