[SVG] Handle repeat(n) event for svg animations

LayoutTests/svg/animations/repeatn-event-1b.svg

Index: LayoutTests/svg/animations/repeatn-event-1b.svg
diff --git a/LayoutTests/svg/animations/repeatn-event-1b.svg b/LayoutTests/svg/animations/repeatn-event-1b.svg
new file mode 100755
index 0000000000000000000000000000000000000000..bcd39052e45223cbf824e460e47d0daa98b98209
--- /dev/null
+++ b/LayoutTests/svg/animations/repeatn-event-1b.svg
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1 Tiny//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11-tiny.dtd">
+<svg onload="loaded()" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+  <rect x="0" y="0" width="0" height="100" fill="green">
+    <animate id="anim" attributeName="visibility" to="visible" begin="0s" dur="2s" repeatCount="4"/>
+    <set attributeName="width" to="100" begin="anim.repeat(1)"/>
+  </rect>
+  <script>
+    if (window.testRunner)
+      testRunner.waitUntilDone();
+
+    function loaded() {
+      document.documentElement.setCurrentTime(2);
+
+      if (window.testRunner)
+        setTimeout(function(){testRunner.notifyDone();}, 10);
+    }
+  </script>
+</svg>