Roll Observatory packages and add a roll script

packages/petitparser/test/core_benchmark.dart

+library petitparser.test.all_benchmark;
+
+import 'package:petitparser/petitparser.dart';
+
+double benchmark(Function function,
+    [int warmup = 100, int milliseconds = 2500]) {
+  var count = 0;
+  var elapsed = 0;
+  var watch = new Stopwatch();
+  while (warmup-- > 0) {
+    function();
+  }
+  watch.start();
+  while (elapsed < milliseconds) {
+    function();
+    elapsed = watch.elapsedMilliseconds;
+    count++;
+  }
+  return elapsed / count;
+}
+
+Function charTest(List<String> inputs, Parser parser) {
+  return () {
+    for (var i = 0; i < inputs.length; i++) {
+      parser.parse(inputs[i]);
+    }
+  };
+}
+
+final characters = new List.generate(256, (value) => new String.fromCharCode(value));
+
+Function stringTest(String input, Parser parser) {
+  return () {
+    parser.parse(input);
+  };
+}
+
+final string = characters.join();
+
+final benchmarks = {
+
+  // char tests
+  "any()": charTest(characters, any()),
+  "anyOf('uncopyrightable')": charTest(characters, anyOf('uncopyrightable')),
+  "char('a')": charTest(characters, char('a')),
+  "digit()": charTest(characters, digit()),
+  "letter()": charTest(characters, letter()),
+  "lowercase()": charTest(characters, lowercase()),
+  "noneOf('uncopyrightable')": charTest(characters, noneOf('uncopyrightable')),
+  "pattern('^a')": charTest(characters, pattern('^a')),
+  "pattern('^a-cx-zA-CX-Z1-37-9')": charTest(characters, pattern('^a-cx-zA-CX-Z1-37-9')),
+  "pattern('^a-z')": charTest(characters, pattern('^a-z')),
+  "pattern('^acegik')": charTest(characters, pattern('^acegik')),
+  "pattern('a')": charTest(characters, pattern('a')),
+  "pattern('a-cx-zA-CX-Z1-37-9')": charTest(characters, pattern('a-cx-zA-CX-Z1-37-9')),
+  "pattern('a-z')": charTest(characters, pattern('a-z')),
+  "pattern('acegik')": charTest(characters, pattern('acegik')),
+  "range('a', 'z')": charTest(characters, range('a', 'z')),
+  "uppercase()": charTest(characters, uppercase()),
+  "whitespace()": charTest(characters, whitespace()),
+  "word()": charTest(characters, word()),
+
+  // combinator tests
+  "star()": stringTest(string, any().star()),
+  "starLazy()": stringTest(string, any().starLazy(failure())),
+  "starGreedy()": stringTest(string, any().starGreedy(failure())),
+  "plus()": stringTest(string, any().plus()),
+  "plusLazy()": stringTest(string, any().plusLazy(failure())),
+  "plusGreedy()": stringTest(string, any().plusGreedy(failure())),
+  "or()": stringTest(string, failure().or(any()).star()),
+  "seq()": stringTest(string, new SequenceParser(new List.filled(string.length, any()))),
+};
+
+void main() {
+  print('<?xml version="1.0"?>');
+  print('<benchmarks>');
+  for (var name in benchmarks.keys) {
+    print('  <benchmark name="$name">${benchmark(benchmarks[name])}</benchmark>');
+  }
+  print('</benchmarks>');
+}