Turn on harmony arrays and regexp.

sky/examples/fps-counter.sky

Index: sky/examples/fps-counter.sky
diff --git a/sky/examples/fps-counter.sky b/sky/examples/fps-counter.sky
index 21fa0a1ce650926588e845120f66547ef7baa1e4..e560d064f117ce6662959481e16a03c2ef1d1cbb 100644
--- a/sky/examples/fps-counter.sky
+++ b/sky/examples/fps-counter.sky
@@ -26,11 +26,9 @@ module.exports = class extends SkyElement {
     this.rafId = 0;
     this.currentDeltaIndex = 0;
     this.deltas = new Array(kMaxDeltaLength);
-    for (var i = 0; i < kMaxDeltaLength; ++i)
-      this.deltas[i] = 0;
+    this.deltas.fill(0);
     this.history = new Array(kMaxDeltaLength);
-    for (var i = 0; i < kMaxDeltaLength; ++i)
-      this.history[i] = 0;
+    this.history.fill(0);
   }
   attached() {
     this.scheduleTick();