Opt out of composited scrolling with border radius.

LayoutTests/compositing/overflow/scroller-with-border-radius.html

Index: LayoutTests/compositing/overflow/scroller-with-border-radius.html
diff --git a/LayoutTests/compositing/overflow/descendant-with-clip-path.html b/LayoutTests/compositing/overflow/scroller-with-border-radius.html
similarity index 79%
copy from LayoutTests/compositing/overflow/descendant-with-clip-path.html
copy to LayoutTests/compositing/overflow/scroller-with-border-radius.html
index 2118dba60e91d1d2ad506d66e9359f72aae39a56..3f408907eae96ee774f6e60ed37351769e5b9f77 100644
--- a/LayoutTests/compositing/overflow/descendant-with-clip-path.html
+++ b/LayoutTests/compositing/overflow/scroller-with-border-radius.html
@@ -7,10 +7,10 @@
     background-color: red;
 }
 
-#inner {
+#scrolled {
     height: 1000px;
     width: 250px;
-    background-color: blue;
+    background-color: green;
 }
 
 #fixed {
@@ -23,9 +23,8 @@
 }
 </style>
 <div id="scroller">
-    <div id="inner">
-        <div id="fixed"></div>
-    </div>
+    <div id="scrolled"></div>
+    <div id="fixed"></div>
 </div>
 <script>
 function isUsingCompositedScrolling(layer) {
@@ -52,16 +51,16 @@ var result = "";
 
 onload = function() {
     if (window.internals) {
-        result += "No clip path descendant (should be using composited scrolling): ";
+        result += "No border radius (should be using composited scrolling): ";
         if (isUsingCompositedScrolling(JSON.parse(window.internals.layerTreeAsText(document))))
             result += "Pass.\n";
         else
             result += "Fail.\n"
     }
-    document.getElementById("inner").style.webkitClipPath = "polygon(40px 550px,432px 302px,409px 237px,46px 156px)";
+    document.getElementById("scroller").style.borderRadius = '5px';
     requestAnimationFrame(function() {
         if (window.internals) {
-            result += "Has clip path descendant (should not be using composited scrolling): ";
+            result += "Has border radius (should not be using composited scrolling): ";
             if (!isUsingCompositedScrolling(JSON.parse(window.internals.layerTreeAsText(document))))
                 result += "Pass.\n";
             else