Update mojo sdk to rev f6c8ec07c01deebc13178d516225fd12695c3dc2

mojo/public/dart/src/timer_queue.dart

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+part of core;
+
+class Timeout implements Comparable<Timeout> {
+  int deadline;  // milliseconds since the Unix epoch.
+  SendPort port;
+
+  Timeout(this.port, this.deadline);
+
+  int compareTo(Timeout other)  => other.daedline - deadline;
+}
+
+class TimerQueue {
+  SplayTreeSet _set;
+  Timeout _nextTimer;
+
+  TimerQueue() : _set = new SplayTreeSet();
+
+  void updateTimer(SendPort port, int deadline) {
+    var removedTimeout = null;
+    _set.removeWhere((timeout) {
+      if (timeout.port == port) {
+        removedTimeout = timeout;
+        return true;
+      }
+      return false;
+    });
+
+    if ((removedTimeout == null) && (deadline >= 0)) {
+      _set.add(new Timeout(port, deadline));
+    } else {
+      if (deadline > 0) {
+        removedTimeout.deadline = deadline;
+        _set.add(removedTimeout);
+      }
+    }
+
+    if (_set.isNotEmpty) {
+      _nextTimer = _set.first;
+    } else {
+      _nextTimer = null;
+    }
+  }
+
+  void removeCurrent() => updateTimer(currentPort, -1);
+
+  bool get hasTimer => _nextTimer != null;
+  int get currentTimeout => _nextTimer.deadline;
+  SendPort get currentPort => _nextTimer.port;
+}