System.timeMillis method renamed to measureTimeMillis and measureTimeNano added

examples/src/benchmarks/LockPerf.kt

@@ -21,7 +21,7 @@ fun main(args: Array<String>) {
     while(threadNum <= 1024) {
         val counter = AtomicInteger()
 
-        val duration = millisTime {
+        val duration = measureTimeMillis {
             threadNum.latch{
                 val lock = ReentrantLock()
                 for(i in 0..threadNum-1) {

stdlib/ktSrc/System.kt

@@ -3,8 +3,17 @@ namespace std.util
 /**
 Executes current block and returns elapsed time in milliseconds
 */
-fun millisTime(block: fun() : Unit) : Long {
+fun measureTimeMillis(block: fun() : Unit) : Long {
     val start = System.currentTimeMillis()
     block()
     return System.currentTimeMillis() - start
+}
+
+/**
+Executes current block and returns elapsed time in milliseconds
+*/
+fun measureTimeNano(block: fun() : Unit) : Long {
+    val start = System.nanoTime()
+    block()
+    return System.nanoTime() - start
 }