Hit test on the layer tree rather than the RSLL

cc/trees/layer_tree_host_impl_unittest.cc

Index: cc/trees/layer_tree_host_impl_unittest.cc
diff --git a/cc/trees/layer_tree_host_impl_unittest.cc b/cc/trees/layer_tree_host_impl_unittest.cc
index 02f383fbc60c2c89248898ecfb5abdfb9551ee7f..b5327d6a7b47d1cfdcaa70464ee76d160aefd6c5 100644
--- a/cc/trees/layer_tree_host_impl_unittest.cc
+++ b/cc/trees/layer_tree_host_impl_unittest.cc
@@ -6140,7 +6140,7 @@ TEST_F(LayerTreeHostImplTest, ScrollUnknownScrollAncestorMismatch) {
   occluder_layer->SetDrawsContent(true);
   occluder_layer->SetBounds(content_size);
   occluder_layer->SetContentBounds(content_size);
-  occluder_layer->SetPosition(gfx::PointF());
+  occluder_layer->SetPosition(gfx::PointF(-10.f, -10.f));
   occluder_layer->SetAnchorPoint(gfx::PointF());
 
   int child_scroll_clip_layer_id = 7;
@@ -6151,7 +6151,7 @@ TEST_F(LayerTreeHostImplTest, ScrollUnknownScrollAncestorMismatch) {
   scoped_ptr<LayerImpl> child_scroll = CreateScrollableLayer(
       child_scroll_layer_id, content_size, child_scroll_clip.get());
 
-  child_scroll->SetDrawsContent(false);
+  child_scroll->SetPosition(gfx::PointF(10.f, 10.f));
 
   child_scroll->AddChild(occluder_layer.Pass());
   scroll_layer->AddChild(child_scroll.Pass());