Hit test on the layer tree rather than the RSLL

cc/trees/layer_tree_host_impl_unittest.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/trees/layer_tree_host_impl.h"
 
 #include <cmath>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 6122 matching lines @@
   LayerImpl* scroll_layer =
       host_impl_->active_tree()->LayerById(scroll_layer_id);
   scroll_layer->SetDrawsContent(true);
 
   int occluder_layer_id = 6;
   scoped_ptr<LayerImpl> occluder_layer =
       LayerImpl::Create(host_impl_->active_tree(), occluder_layer_id);
   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;
   scoped_ptr<LayerImpl> child_scroll_clip =
       LayerImpl::Create(host_impl_->active_tree(), child_scroll_clip_layer_id);
 
   int child_scroll_layer_id = 8;
   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());
 
   DrawFrame();
 
   EXPECT_EQ(InputHandler::ScrollUnknown,
             host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel));
 }
 
@@ skipping 376 matching lines @@
   FakePictureLayerImpl* active_mask_content =
       static_cast<FakePictureLayerImpl*>(
           host_impl_->active_tree()->root_layer()->children()[0]->mask_layer());
   gfx::Rect r2 = active_mask_content->visible_rect_for_tile_priority();
 
   ASSERT_TRUE(!r2.IsEmpty());
 }
 
 }  // namespace
 }  // namespace cc