Splitting of layers for correct intersections

cc/trees/layer_tree_host_common_unittest.cc

Index: cc/trees/layer_tree_host_common_unittest.cc
diff --git a/cc/trees/layer_tree_host_common_unittest.cc b/cc/trees/layer_tree_host_common_unittest.cc
index 01941c1364a37436f78657504adf8bd18ace9268..0165eba0b3e298b086a1d1505a5a2b687ba82406 100644
--- a/cc/trees/layer_tree_host_common_unittest.cc
+++ b/cc/trees/layer_tree_host_common_unittest.cc
@@ -6,6 +6,7 @@
 
 #include <algorithm>
 #include <set>
+#include <tuple>
 
 #include "cc/animation/layer_animation_controller.h"
 #include "cc/animation/transform_operations.h"
@@ -7510,110 +7511,6 @@ TEST_F(LayerTreeHostCommonTest, OutOfOrderClippingRequiresRSLLSorting) {
   EXPECT_TRUE(render_surface_layer_list.at(2)->render_surface());
 }
 
-TEST_F(LayerTreeHostCommonTest, DoNotClobberSorting) {
-  // We rearrange layer list contributions if we have to visit children out of
-  // order, but it should be a 'stable' rearrangement. That is, the layer list
-  // additions for a single layer should not be reordered, though their position
-  // wrt to the contributions due to a sibling may vary.
-  //
-  // + root
-  //   + scroll_child
-  //     + top_content
-  //     + bottom_content
-  //   + scroll_parent_border
-  //     + scroll_parent_clip
-  //       + scroll_parent
-  //
-  FakeImplProxy proxy;
-  TestSharedBitmapManager shared_bitmap_manager;
-  FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
-  host_impl.CreatePendingTree();
-  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl.active_tree(), 1);
-  scoped_ptr<LayerImpl> scroll_parent_border =
-      LayerImpl::Create(host_impl.active_tree(), 2);
-  scoped_ptr<LayerImpl> scroll_parent_clip =
-      LayerImpl::Create(host_impl.active_tree(), 3);
-  scoped_ptr<LayerImpl> scroll_parent =
-      LayerImpl::Create(host_impl.active_tree(), 4);
-  scoped_ptr<LayerImpl> scroll_child =
-      LayerImpl::Create(host_impl.active_tree(), 5);
-  scoped_ptr<LayerImpl> bottom_content =
-      LayerImpl::Create(host_impl.active_tree(), 6);
-  scoped_ptr<LayerImpl> top_content =
-      LayerImpl::Create(host_impl.active_tree(), 7);
-
-  scroll_parent_clip->SetMasksToBounds(true);
-
-  scroll_child->SetScrollParent(scroll_parent.get());
-  scoped_ptr<std::set<LayerImpl*>> scroll_children(new std::set<LayerImpl*>);
-  scroll_children->insert(scroll_child.get());
-  scroll_parent->SetScrollChildren(scroll_children.release());
-
-  scroll_child->SetDrawsContent(true);
-  scroll_parent->SetDrawsContent(true);
-  top_content->SetDrawsContent(true);
-  bottom_content->SetDrawsContent(true);
-
-  gfx::Transform identity_transform;
-  gfx::Transform top_transform;
-  top_transform.Translate3d(0.0, 0.0, 5.0);
-  gfx::Transform bottom_transform;
-  bottom_transform.Translate3d(0.0, 0.0, 3.0);
-
-  SetLayerPropertiesForTesting(root.get(), identity_transform, gfx::Point3F(),
-                               gfx::PointF(), gfx::Size(50, 50), true, false,
-                               true);
-  SetLayerPropertiesForTesting(scroll_parent_border.get(), identity_transform,
-                               gfx::Point3F(), gfx::PointF(), gfx::Size(40, 40),
-                               true, false, false);
-  SetLayerPropertiesForTesting(scroll_parent_clip.get(), identity_transform,
-                               gfx::Point3F(), gfx::PointF(), gfx::Size(30, 30),
-                               true, false, false);
-  SetLayerPropertiesForTesting(scroll_parent.get(), identity_transform,
-                               gfx::Point3F(), gfx::PointF(), gfx::Size(50, 50),
-                               true, false, false);
-  SetLayerPropertiesForTesting(scroll_child.get(), identity_transform,
-                               gfx::Point3F(), gfx::PointF(), gfx::Size(50, 50),
-                               true, false, false);
-  SetLayerPropertiesForTesting(top_content.get(), top_transform, gfx::Point3F(),
-                               gfx::PointF(), gfx::Size(50, 50), false, true,
-                               true);
-  SetLayerPropertiesForTesting(bottom_content.get(), bottom_transform,
-                               gfx::Point3F(), gfx::PointF(), gfx::Size(50, 50),
-                               false, true, true);
-
-  scroll_child->SetShouldFlattenTransform(false);
-  scroll_child->Set3dSortingContextId(1);
-
-  scroll_child->AddChild(top_content.Pass());
-  scroll_child->AddChild(bottom_content.Pass());
-  root->AddChild(scroll_child.Pass());
-
-  scroll_parent_clip->AddChild(scroll_parent.Pass());
-  scroll_parent_border->AddChild(scroll_parent_clip.Pass());
-  root->AddChild(scroll_parent_border.Pass());
-
-  LayerImplList render_surface_layer_list;
-  LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
-      root.get(), root->bounds(), &render_surface_layer_list);
-
-  LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-
-  EXPECT_TRUE(root->render_surface());
-
-  // If we don't sort by depth and let the layers get added in the order they
-  // would normally be visited in, then layers 6 and 7 will be out of order. In
-  // other words, although we've had to shift 5, 6, and 7 to appear before 4
-  // in the list (because of the scroll parent relationship), this should not
-  // have an effect on the the order of 5, 6, and 7 (which had been reordered
-  // due to layer sorting).
-  EXPECT_EQ(4u, root->render_surface()->layer_list().size());
-  EXPECT_EQ(5, root->render_surface()->layer_list().at(0)->id());
-  EXPECT_EQ(6, root->render_surface()->layer_list().at(1)->id());
-  EXPECT_EQ(7, root->render_surface()->layer_list().at(2)->id());
-  EXPECT_EQ(4, root->render_surface()->layer_list().at(3)->id());
-}
-
 TEST_F(LayerTreeHostCommonTest, ScrollCompensationWithRounding) {
   // This test verifies that a scrolling layer that gets snapped to
   // integer coordinates doesn't move a fixed position child.