Add utility tool to update .status files automatically

pkg/compiler/tool/status_files/log_parser.dart

+// Copyright (c) 2017, 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.
+
+library status_files.log_parser;
+
+import 'record.dart';
+
+/// Extracts test records from a test.py [log].
+List<Record> parse(String log) {
+  var records = [];
+  var suite;
+  var test;
+  var config;
+  var expected;
+  var actual;
+  bool reproIsNext = false;
+  for (var line in log.split('\n')) {
+    if (line.startsWith("FAILED: ")) {
+      int space = line.lastIndexOf(' ');
+      test = line.substring(space + 1).trim();
+      suite = '';
+      var slash = test.indexOf('/');
+      if (slash > 0) {
+        suite = test.substring(0, slash).trim();
+        test = test.substring(slash + 1).trim();
+      }
+      config = line
+          .substring("FAILED: ".length, space)
+          .replaceAll('release_ia32', '')
+          .replaceAll('release_x64', '');
+    }
+    if (line.startsWith("Expected: ")) {
+      expected = line.substring("Expected: ".length).trim();
+    }
+    if (line.startsWith("Actual: ")) {
+      actual = line.substring("Actual: ".length).trim();
+    }
+    if (reproIsNext) {
+      records
+          .add(new Record(suite, test, config, expected, actual, line.trim()));
+      suite = test = config = expected = actual = null;
+      reproIsNext = false;
+    }
+    if (line.startsWith("Short reproduction command (experimental):")) {
+      reproIsNext = true;
+    }
+  }
+  return records;
+}