Initial scroll-blocks-on compositor integration

LayoutTests/compositing/squashing/no-squashing-for-scroll-blocks-on.html

Index: LayoutTests/compositing/squashing/no-squashing-for-scroll-blocks-on.html
diff --git a/LayoutTests/compositing/squashing/no-squashing-for-filters.html b/LayoutTests/compositing/squashing/no-squashing-for-scroll-blocks-on.html
similarity index 76%
copy from LayoutTests/compositing/squashing/no-squashing-for-filters.html
copy to LayoutTests/compositing/squashing/no-squashing-for-scroll-blocks-on.html
index d775fa5790d75b41d46a34ead0a73e054b1a3fe5..134208bfa299f93a6eca0fb1ffd13301aa5ede20 100644
--- a/LayoutTests/compositing/squashing/no-squashing-for-filters.html
+++ b/LayoutTests/compositing/squashing/no-squashing-for-scroll-blocks-on.html
@@ -5,15 +5,15 @@
 }
 </style>
 <div style="width: 100px; height: 100px; transform: translateZ(0); background: lightblue"></div>
-<div class="trysquashed" style="position: absolute; top: 0px; left: 0px; -webkit-filter: drop-shadow(1px 1px 2px #000)"></div>
+<div class="trysquashed" style="position: absolute; top: 0px; left: 0px; scroll-blocks-on: scroll-event;"></div>
 <div class="trysquashed" style="position: absolute; top: 50px; left: 50px;"></div>
 
 <pre id="layers"></pre>
 <script>
-// Tests that layers with filters are not squashed.
+// Tests that layers with scroll-blocks-on are not squashed.
 if (window.testRunner)
     window.testRunner.dumpAsText();
 var layersResult = document.getElementById('layers');
 if (window.internals)
-    layersResult.innerText = window.internals.layerTreeAsText(document);
-</script>
+    layersResult.innerText = window.internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_SCROLL_BLOCKS_ON);
+</script>