Rework Timer interface.

sdk/lib/_internal/compiler/implementation/lib/async_patch.dart

Index: sdk/lib/_internal/compiler/implementation/lib/async_patch.dart
diff --git a/sdk/lib/_internal/compiler/implementation/lib/async_patch.dart b/sdk/lib/_internal/compiler/implementation/lib/async_patch.dart
index 0fccce2a432b6eb93bf2af79f0d317545e165f69..0e0a70d2e4620d53530b8b8eb24c3f0b2809d2d2 100644
--- a/sdk/lib/_internal/compiler/implementation/lib/async_patch.dart
+++ b/sdk/lib/_internal/compiler/implementation/lib/async_patch.dart
@@ -6,16 +6,35 @@
 
 import 'dart:_isolate_helper' show TimerImpl;
 
+typedef void _TimerCallback0();
+typedef void _TimerCallback1(Timer timer);
+
 patch class Timer {
-  patch factory Timer(int milliseconds, void callback(Timer timer)) {
-    return new TimerImpl(milliseconds, callback);
+  patch factory Timer(var duration, var callback) {
+    // TODO(floitsch): remove these checks when we remove the deprecated
+    // millisecond argument and the 1-argument callback. Also remove the
+    // int-test below.
+    if (callback is! _TimerCallback0 && callback is! _TimerCallback1) {
+      throw new ArgumentError(callback);
+    }
+    int milliseconds = duration is int ? duration : duration.inMilliseconds;
+    if (milliseconds < 0) milliseconds = 0;
+    Timer timer;
+    _TimerCallback0 zeroArgumentCallback =
+        callback is _TimerCallback0 ? callback : () => callback(timer);
+    timer = new TimerImpl(milliseconds, zeroArgumentCallback);
+    return timer;
   }
 
   /**
    * Creates a new repeating timer. The [callback] is invoked every
    * [milliseconds] millisecond until cancelled.
    */
-  patch factory Timer.repeating(int milliseconds, void callback(Timer timer)) {
+  patch factory Timer.repeating(var duration, void callback(Timer timer)) {
+    // TODO(floitsch): remove this check when we remove the deprecated
+    // millisecond argument.
+    int milliseconds = duration is int ? duration : duration.inMilliseconds;
+    if (milliseconds < 0) milliseconds = 0;
     return new TimerImpl.repeating(milliseconds, callback);
   }
 }