Added extension duration -> ticks.

Author: simphotonics

lib/src/extension/duration_to_ticks.dart

@@ -0,0 +1,6 @@
+extension DurationToTicks on Duration {
+  static final frequency = Stopwatch().frequency;
+
+  /// Returns `this` duration as clock ticks.
+  int get inTicks => inMicroseconds * frequency ~/ 1000000;
+}