Add observatory_pub_packages snapshot to third_party

observatory_pub_packages/analyzer/src/generated/utilities_general.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.
+
+// This code was auto-generated, is not intended to be edited, and is subject to
+// significant change. Please see the README file for more information.
+
+library engine.utilities.general;
+
+/**
+ * Helper for measuring how much time is spent doing some operation.
+ */
+class TimeCounter {
+  static final int NANOS_PER_MILLI = 1000 * 1000;
+  static final int NANOS_PER_MICRO = 1000;
+  static TimeCounter _current = null;
+  final Stopwatch _sw = new Stopwatch();
+
+  /**
+   * @return the number of milliseconds spent between [start] and [stop].
+   */
+  int get result => _sw.elapsedMilliseconds;
+
+  /**
+   * Starts counting time.
+   *
+   * @return the [TimeCounterHandle] that should be used to stop counting.
+   */
+  TimeCounter_TimeCounterHandle start() {
+    return new TimeCounter_TimeCounterHandle(this);
+  }
+}
+
+/**
+ * The handle object that should be used to stop and update counter.
+ */
+class TimeCounter_TimeCounterHandle {
+  final TimeCounter _counter;
+  int _startMicros;
+  TimeCounter _prev;
+
+  TimeCounter_TimeCounterHandle(this._counter) {
+    // if there is some counter running, pause it
+    _prev = TimeCounter._current;
+    if (_prev != null) {
+      _prev._sw.stop();
+    }
+    TimeCounter._current = _counter;
+    // start this counter
+    _startMicros = _counter._sw.elapsedMicroseconds;
+    _counter._sw.start();
+  }
+
+  /**
+   * Stops counting time and updates counter.
+   */
+  int stop() {
+    _counter._sw.stop();
+    int elapsed = (_counter._sw.elapsedMicroseconds - _startMicros) *
+        TimeCounter.NANOS_PER_MICRO;
+    // restore previous counter and resume it
+    TimeCounter._current = _prev;
+    if (_prev != null) {
+      _prev._sw.start();
+    }
+    // done
+    return elapsed;
+  }
+}