Initial prototype of Duration and Clocks API

libraries/stdlib/js/src/kotlin/time/DurationUnit.kt

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+/*
+ * Copyright 2010-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package kotlin.time
+
+public actual enum class DurationUnit {
+    /**
+     * Time unit representing one nanosecond, which is 1/1000 of a microsecond.
+     */
+    NANOSECONDS,
+    /**
+     * Time unit representing one microsecond, which is 1/1000 of a millisecond.
+     */
+    MICROSECONDS,
+    /**
+     * Time unit representing one millisecond, which is 1/1000 of a second.
+     */
+    MILLISECONDS,
+    /**
+     * Time unit representing one second.
+     */
+    SECONDS,
+    /**
+     * Time unit representing one minute.
+     */
+    MINUTES,
+    /**
+     * Time unit representing one hour.
+     */
+    HOURS,
+    /**
+     * Time unit representing one day, which always equals 24 hours.
+     */
+    DAYS;
+}

libraries/stdlib/js/src/kotlin/time/MonoClock.kt

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+/*
+ * Copyright 2010-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package kotlin.time
+
+public actual object MonoClock : Clock {
+    override fun mark(initialElapsed: Duration): ClockMark {
+        TODO("not implemented: base on high-res browser or node perf counter")
+    }
+}

libraries/stdlib/js/src/kotlin/time/conversions.kt

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+/*
+ * Copyright 2010-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package kotlin.time
+
+public actual fun convertDurationUnit(value: Double, sourceUnit: DurationUnit, targetUnit: DurationUnit): Double {
+    TODO("not implemented")
+}

libraries/stdlib/js/src/kotlin/time/formatToDecimals.kt

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+/*
+ * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package kotlin.time
+
+internal actual fun formatToDecimals(value: Double, decimals: Int, unitName: String): String {
+    TODO("not implemented")
+}