Add missing reftest files for bug 506096

layout/reftests/svg/smil/anim-discrete-to-1.svg

@@ -0,0 +1,10 @@
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     class="reftest-wait"
+     onload="setTimeAndSnapshot(0.0, true)">
+  <script xlink:href="smil-util.js" type="text/javascript"/>
+  <rect x="15" y="15" width="200" height="200" fill="blue">
+    <animate attributeName="height" calcMode="discrete"
+             to="100" dur="2s"/>
+  </rect>
+</svg>

layout/reftests/svg/smil/anim-discrete-to-2.svg

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+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     class="reftest-wait"
+     onload="setTimeAndSnapshot(0.99, true)">
+  <script xlink:href="smil-util.js" type="text/javascript"/>
+  <rect x="15" y="15" width="200" height="200" fill="blue">
+    <animate attributeName="height" calcMode="discrete"
+             to="100" dur="2s"/>
+  </rect>
+</svg>

layout/reftests/svg/smil/anim-discrete-to-3.svg

@@ -0,0 +1,10 @@
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     class="reftest-wait"
+     onload="setTimeAndSnapshot(1.0, true)">
+  <script xlink:href="smil-util.js" type="text/javascript"/>
+  <rect x="15" y="15" width="200" height="100" fill="blue">
+    <animate attributeName="height" calcMode="discrete"
+             to="200" dur="2s"/>
+  </rect>
+</svg>

layout/reftests/svg/smil/anim-discrete-to-4.svg

@@ -0,0 +1,10 @@
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     class="reftest-wait"
+     onload="setTimeAndSnapshot(2.5, false)">
+  <script xlink:href="smil-util.js" type="text/javascript"/>
+  <rect x="15" y="15" width="200" height="100" fill="blue">
+    <animate attributeName="height" calcMode="discrete"
+             to="200" dur="2s" fill="freeze"/>
+  </rect>
+</svg>