Changes subtreeShouldRenderToSeparateSurface logic to account for explicit clipping

cc/layer.cc

Index: cc/layer.cc
diff --git a/cc/layer.cc b/cc/layer.cc
index dfc1c91a9d5e4eb877a38abc04ee07846c7fcd4e..f64c319a81fe9154135e01611bc5f5cc0cf6b930 100644
--- a/cc/layer.cc
+++ b/cc/layer.cc
@@ -129,6 +129,11 @@ bool Layer::blocksPendingCommit() const
     return false;
 }
 
+bool Layer::canClipSelf() const
+{
+    return false;
+}
+
 void Layer::setParent(Layer* layer)
 {
     DCHECK(!layer || !layer->hasAncestor(this));