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

LayoutTests/svg/animations/script-tests/repeatn-remove-add-animation.js

+description("This removes and adds an animation element while the animation is repeating");
+embedSVGTestCase("resources/repeatn-remove-add-animation.svg");
+
+// Setup animation test
+function sample1() {
+    expectFillColor(rect1, 0, 255, 0);
+    expectFillColor(rect2, 255, 0, 0);
+    expectFillColor(rect3, 255, 0, 0);
+    expectFillColor(rect4, 255, 0, 0);
+}
+
+function sample2() {
+    expectFillColor(rect1, 0, 255, 0);
+    expectFillColor(rect2, 0, 255, 0);
+    expectFillColor(rect3, 255, 0, 0);
+    expectFillColor(rect4, 255, 0, 0);
+}
+
+function sample3() {
+    expectFillColor(rect1, 0, 255, 0);
+    expectFillColor(rect2, 0, 255, 0);
+    expectFillColor(rect3, 0, 255, 0);
+    expectFillColor(rect4, 255, 0, 0);
+}
+
+function sample4() {
+    expectFillColor(rect1, 0, 255, 0);
+    expectFillColor(rect2, 0, 255, 0);
+    expectFillColor(rect3, 0, 255, 0);
+    expectFillColor(rect4, 0, 255, 0);
+}
+
+function recreate() {
+    var anim1 = rootSVGElement.ownerDocument.getElementById("anim");
+    anim1.parentNode.removeChild(anim1);
+    var anim2 = createSVGElement("animate");
+    anim2.setAttribute("id", "anim");
+    anim2.setAttribute("attributeName", "visibility");
+    anim2.setAttribute("to", "visible");
+    anim2.setAttribute("begin", "0s");
+    anim2.setAttribute("dur", "2s");
+    anim2.setAttribute("repeatCount", "4");
+    rootSVGElement.appendChild(anim2);
+}
+
+function executeTest() {
+    var rects = rootSVGElement.ownerDocument.getElementsByTagName("rect");
+    rect1 = rects[0];
+    rect2 = rects[1];
+    rect3 = rects[2];
+    rect4 = rects[3];
+
+    const expectedValues = [
+        // [animationId, time, sampleCallback]
+        ["anim", 0.0, sample1],
+        ["anim", 0.001, sample1],
+        ["anim", 2.0, sample1],
+        ["anim", 2.001, sample2],
+        ["anim", 4.0, sample2],
+        ["anim", 4.001, sample3],
+        ["anim", 5.0, recreate],
+        ["anim", 6.0, sample3],
+        ["anim", 6.001, sample4]
+    ];
+
+    runAnimationTest(expectedValues);
+}
+
+window.animationStartsImmediately = true;
+var successfullyParsed = true;