cc : Move LayerImpl::children to test properties

cc/trees/damage_tracker_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/damage_tracker.h"
 
 #include <stddef.h>
 
 #include "cc/base/math_util.h"
 #include "cc/layers/layer_impl.h"
@@ skipping 187 matching lines @@
 
   EXPECT_EQ(gfx::Rect(500, 500).ToString(), root_damage_rect.ToString());
 }
 
 TEST_F(DamageTrackerTest, SanityCheckTestTreeWithTwoSurfaces) {
   // Sanity check that the complex test tree will actually produce the expected
   // render surfaces and layer lists.
 
   LayerImpl* root = CreateAndSetUpTestTreeWithTwoSurfaces();
 
-  LayerImpl* child1 = root->children()[0];
-  LayerImpl* child2 = root->children()[1];
+  LayerImpl* child1 = root->test_properties()->children[0];
+  LayerImpl* child2 = root->test_properties()->children[1];
   gfx::Rect child_damage_rect =
       child1->render_surface()->damage_tracker()->current_damage_rect();
   gfx::Rect root_damage_rect =
       root->render_surface()->damage_tracker()->current_damage_rect();
 
   ASSERT_TRUE(child1->render_surface());
   EXPECT_FALSE(child2->render_surface());
   EXPECT_EQ(3u, root->render_surface()->layer_list().size());
   EXPECT_EQ(2u, child1->render_surface()->layer_list().size());
 
   // The render surface for child1 only has a content_rect that encloses
   // grand_child1 and grand_child2, because child1 does not draw content.
   EXPECT_EQ(gfx::Rect(190, 190, 16, 18).ToString(),
             child_damage_rect.ToString());
   EXPECT_EQ(gfx::Rect(500, 500).ToString(), root_damage_rect.ToString());
 }
 
 TEST_F(DamageTrackerTest, VerifyDamageForUpdateRects) {
   LayerImpl* root = CreateAndSetUpTestTreeWithOneSurface();
-  LayerImpl* child = root->children()[0];
+  LayerImpl* child = root->test_properties()->children[0];
 
   // CASE 1: Setting the update rect should cause the corresponding damage to
   //         the surface.
   ClearDamageForAllSurfaces(root);
   child->SetUpdateRect(gfx::Rect(10, 11, 12, 13));
   root->layer_tree_impl()->property_trees()->needs_rebuild = true;
   EmulateDrawingOneFrame(root);
 
   // Damage position on the surface should be: position of update_rect (10, 11)
   // relative to the child (100, 100).
@@ skipping 22 matching lines @@
 
   // Damage position on the surface should be: position of update_rect (20, 25)
   // relative to the child (100, 100).
   root_damage_rect =
           root->render_surface()->damage_tracker()->current_damage_rect();
   EXPECT_EQ(gfx::Rect(120, 125, 1, 2).ToString(), root_damage_rect.ToString());
 }
 
 TEST_F(DamageTrackerTest, VerifyDamageForLayerDamageRects) {
   LayerImpl* root = CreateAndSetUpTestTreeWithOneSurface();
-  LayerImpl* child = root->children()[0];
+  LayerImpl* child = root->test_properties()->children[0];
 
   // CASE 1: Adding the layer damage rect should cause the corresponding damage
   // to the surface.
   ClearDamageForAllSurfaces(root);
   child->AddDamageRect(gfx::Rect(10, 11, 12, 13));
   root->layer_tree_impl()->property_trees()->needs_rebuild = true;
   EmulateDrawingOneFrame(root);
 
   // Damage position on the surface should be: position of layer damage_rect
   // (10, 11) relative to the child (100, 100).
@@ skipping 35 matching lines @@
   // Damage position on the surface should be: position of layer damage_rect
   // (20, 25) relative to the child (100, 100).
   root_damage_rect =
       root->render_surface()->damage_tracker()->current_damage_rect();
   EXPECT_EQ(true, root_damage_rect.Contains(gfx::Rect(120, 125, 1, 2)));
   EXPECT_EQ(true, root_damage_rect.Contains(gfx::Rect(110, 115, 3, 4)));
 }
 
 TEST_F(DamageTrackerTest, VerifyDamageForLayerUpdateAndDamageRects) {
   LayerImpl* root = CreateAndSetUpTestTreeWithOneSurface();
-  LayerImpl* child = root->children()[0];
+  LayerImpl* child = root->test_properties()->children[0];
 
   // CASE 1: Adding the layer damage rect and update rect should cause the
   // corresponding damage to the surface.
   ClearDamageForAllSurfaces(root);
   child->AddDamageRect(gfx::Rect(5, 6, 12, 13));
   child->SetUpdateRect(gfx::Rect(15, 16, 14, 10));
   root->layer_tree_impl()->property_trees()->needs_rebuild = true;
   EmulateDrawingOneFrame(root);
 
   // Damage position on the surface should be: position of unified layer
@@ skipping 24 matching lines @@
 
   // Damage position on the surface should be: position of unified layer damage
   // rect and update rect (5, 10) relative to the child (100, 100).
   root_damage_rect =
       root->render_surface()->damage_tracker()->current_damage_rect();
   EXPECT_EQ(true, root_damage_rect.Contains(gfx::Rect(105, 110, 17, 18)));
 }
 
 TEST_F(DamageTrackerTest, VerifyDamageForPropertyChanges) {
   LayerImpl* root = CreateAndSetUpTestTreeWithOneSurface();
-  LayerImpl* child = root->children()[0];
+  LayerImpl* child = root->test_properties()->children[0];
 
   // CASE 1: The layer's property changed flag takes priority over update rect.
   //
   child->test_properties()->force_render_surface = true;
   root->layer_tree_impl()->property_trees()->needs_rebuild = true;
   EmulateDrawingOneFrame(root);
   ClearDamageForAllSurfaces(root);
   child->SetUpdateRect(gfx::Rect(10, 11, 12, 13));
   child->OnOpacityAnimated(0.5f);
   EmulateDrawingOneFrame(root);
@@ skipping 28 matching lines @@
 
   // Expect damage to be the combination of the previous one and the new one.
   expected_rect.Union(gfx::Rect(200, 230, 30, 30));
   root_damage_rect =
           root->render_surface()->damage_tracker()->current_damage_rect();
   EXPECT_FLOAT_RECT_EQ(expected_rect, root_damage_rect);
 }
 
 TEST_F(DamageTrackerTest, VerifyDamageWhenSurfaceRemoved) {
   LayerImpl* root = CreateAndSetUpTestTreeWithTwoSurfaces();
-  LayerImpl* surface = root->children()[0];
-  LayerImpl* child = surface->children()[0];
+  LayerImpl* surface = root->test_properties()->children[0];
+  LayerImpl* child = surface->test_properties()->children[0];
   child->SetDrawsContent(true);
   EmulateDrawingOneFrame(root);
   ClearDamageForAllSurfaces(root);
 
   surface->test_properties()->force_render_surface = false;
   child->SetDrawsContent(false);
   root->layer_tree_impl()->property_trees()->needs_rebuild = true;
   EmulateDrawingOneFrame(root);
   gfx::Rect root_damage_rect =
       root->render_surface()->damage_tracker()->current_damage_rect();
   EXPECT_EQ(gfx::Rect(290, 290, 16, 18).ToString(),
             root_damage_rect.ToString());
 }
 
 TEST_F(DamageTrackerTest, VerifyDamageForTransformedLayer) {
   // If a layer is transformed, the damage rect should still enclose the entire
   // transformed layer.
 
   LayerImpl* root = CreateAndSetUpTestTreeWithOneSurface();
-  LayerImpl* child = root->children()[0];
+  LayerImpl* child = root->test_properties()->children[0];
   child->test_properties()->force_render_surface = true;
 
   gfx::Transform rotation;
   rotation.Rotate(45.0);
 
   ClearDamageForAllSurfaces(root);
   child->test_properties()->transform_origin = gfx::Point3F(
       child->bounds().width() * 0.5f, child->bounds().height() * 0.5f, 0.f);
   child->SetPosition(gfx::PointF(85.f, 85.f));
   child->NoteLayerPropertyChanged();
@@ skipping 32 matching lines @@
   //
   // The transform is constructed so that if w < 0 clipping is not performed,
   // the incorrect rect will be very small, specifically: position (500.972504,
   // 498.544617) and size 0.056610 x 2.910767.  Instead, the correctly
   // transformed rect should actually be very huge (i.e. in theory, -infinity
   // on the left), and positioned so that the right-most bound rect will be
   // approximately 501 units in root surface space.
   //
 
   LayerImpl* root = CreateAndSetUpTestTreeWithOneSurface();
-  LayerImpl* child = root->children()[0];
+  LayerImpl* child = root->test_properties()->children[0];
 
   gfx::Transform transform;
   transform.Translate3d(500.0, 500.0, 0.0);
   transform.ApplyPerspectiveDepth(1.0);
   transform.RotateAboutYAxis(45.0);
   transform.Translate3d(-50.0, -50.0, 0.0);
 
   // Set up the child
   child->SetPosition(gfx::PointF(0.f, 0.f));
   child->SetBounds(gfx::Size(100, 100));
@@ skipping 20 matching lines @@
   // don't care whether the damage rect was clamped or is larger than the
   // surface for this test.
   gfx::Rect root_damage_rect =
       root->render_surface()->damage_tracker()->current_damage_rect();
   gfx::Rect damage_we_care_about = gfx::Rect(gfx::Size(500, 500));
   EXPECT_TRUE(root_damage_rect.Contains(damage_we_care_about));
 }
 
 TEST_F(DamageTrackerTest, VerifyDamageForBlurredSurface) {
   LayerImpl* root = CreateAndSetUpTestTreeWithTwoSurfaces();
-  LayerImpl* surface = root->children()[0];
-  LayerImpl* child = surface->children()[0];
+  LayerImpl* surface = root->test_properties()->children[0];
+  LayerImpl* child = surface->test_properties()->children[0];
 
   FilterOperations filters;
   filters.Append(FilterOperation::CreateBlurFilter(5.f));
   int outset_top, outset_right, outset_bottom, outset_left;
   filters.GetOutsets(&outset_top, &outset_right, &outset_bottom, &outset_left);
 
   // Setting the filter will damage the whole surface.
   ClearDamageForAllSurfaces(root);
   surface->SetFilters(filters);
   root->layer_tree_impl()->property_trees()->needs_rebuild = true;
@@ skipping 14 matching lines @@
 
   expected_damage_rect.Inset(-outset_left,
                              -outset_top,
                              -outset_right,
                              -outset_bottom);
   EXPECT_EQ(expected_damage_rect.ToString(), root_damage_rect.ToString());
 }
 
 TEST_F(DamageTrackerTest, VerifyDamageForImageFilter) {
   LayerImpl* root = CreateAndSetUpTestTreeWithOneSurface();
-  LayerImpl* child = root->children()[0];
+  LayerImpl* child = root->test_properties()->children[0];
   gfx::Rect root_damage_rect, child_damage_rect;
 
   // Allow us to set damage on child too.
   child->SetDrawsContent(true);
 
   FilterOperations filters;
   filters.Append(FilterOperation::CreateReferenceFilter(
       SkBlurImageFilter::Make(2, 2, nullptr)));
   int outset_top, outset_right, outset_bottom, outset_left;
   filters.GetOutsets(&outset_top, &outset_right, &outset_bottom, &outset_left);
@@ skipping 33 matching lines @@
   int expect_height = 1 + outset_top + outset_bottom;
   EXPECT_EQ(gfx::Rect(100 - outset_left, 100 - outset_top, expect_width,
                       expect_height),
             root_damage_rect);
   EXPECT_EQ(gfx::Rect(-outset_left, -outset_top, expect_width, expect_height),
             child_damage_rect);
 }
 
 TEST_F(DamageTrackerTest, VerifyDamageForTransformedImageFilter) {
   LayerImpl* root = CreateAndSetUpTestTreeWithOneSurface();
-  LayerImpl* child = root->children()[0];
+  LayerImpl* child = root->test_properties()->children[0];
   gfx::Rect root_damage_rect, child_damage_rect;
 
   // Allow us to set damage on child too.
   child->SetDrawsContent(true);
 
   FilterOperations filters;
   filters.Append(FilterOperation::CreateReferenceFilter(
       SkBlurImageFilter::Make(2, 2, nullptr)));
   int outset_top, outset_right, outset_bottom, outset_left;
   filters.GetOutsets(&outset_top, &outset_right, &outset_bottom, &outset_left);
@@ skipping 39 matching lines @@
   int expect_height = 30 + outset_top + outset_bottom;
   EXPECT_EQ(gfx::Rect(100 - outset_left / 2, 100 - outset_top, expect_width / 2,
                       expect_height),
             root_damage_rect);
   EXPECT_EQ(gfx::Rect(-outset_left, -outset_top, expect_width, expect_height),
             child_damage_rect);
 }
 
 TEST_F(DamageTrackerTest, VerifyDamageForBackgroundBlurredChild) {
   LayerImpl* root = CreateAndSetUpTestTreeWithTwoSurfaces();
-  LayerImpl* child1 = root->children()[0];
-  LayerImpl* child2 = root->children()[1];
+  LayerImpl* child1 = root->test_properties()->children[0];
+  LayerImpl* child2 = root->test_properties()->children[1];
 
   // Allow us to set damage on child1 too.
   child1->SetDrawsContent(true);
 
   FilterOperations filters;
   filters.Append(FilterOperation::CreateBlurFilter(2.f));
   int outset_top, outset_right, outset_bottom, outset_left;
   filters.GetOutsets(&outset_top, &outset_right, &outset_bottom, &outset_left);
 
   // Setting the filter will damage the whole surface.
@@ skipping 110 matching lines @@
   // Damage should be (0,0 1x1), offset by the 100,100 offset of child1 in
   // root, and expanded 6px for the 2px blur (i.e., 94,94 13x13), but there
   // should be no damage outside child1 (i.e. none above or to the left of
   // 100,100.
   expected_damage_rect = gfx::Rect(100, 100, 7, 7);
   EXPECT_EQ(expected_damage_rect.ToString(), root_damage_rect.ToString());
 }
 
 TEST_F(DamageTrackerTest, VerifyDamageForAddingAndRemovingLayer) {
   LayerImpl* root = CreateAndSetUpTestTreeWithOneSurface();
-  LayerImpl* child1 = root->children()[0];
+  LayerImpl* child1 = root->test_properties()->children[0];
 
   // CASE 1: Adding a new layer should cause the appropriate damage.
   //
   ClearDamageForAllSurfaces(root);
   {
     std::unique_ptr<LayerImpl> child2 =
         LayerImpl::Create(host_impl_.active_tree(), 3);
     child2->SetPosition(gfx::PointF(400.f, 380.f));
     child2->SetBounds(gfx::Size(6, 8));
     child2->SetDrawsContent(true);
@@ skipping 65 matching lines @@
   // surfaces are tested elsewhere.
   ASSERT_EQ(3u, root->render_surface()->layer_list().size());
 
   gfx::Rect root_damage_rect =
       root->render_surface()->damage_tracker()->current_damage_rect();
   EXPECT_EQ(gfx::Rect(400, 380, 6, 8).ToString(), root_damage_rect.ToString());
 }
 
 TEST_F(DamageTrackerTest, VerifyDamageForMultipleLayers) {
   LayerImpl* root = CreateAndSetUpTestTreeWithOneSurface();
-  LayerImpl* child1 = root->children()[0];
+  LayerImpl* child1 = root->test_properties()->children[0];
 
   // In this test we don't want the above tree manipulation to be considered
   // part of the same frame.
   ClearDamageForAllSurfaces(root);
   {
     std::unique_ptr<LayerImpl> child2 =
         LayerImpl::Create(host_impl_.active_tree(), 3);
     child2->SetPosition(gfx::PointF(400.f, 380.f));
     child2->SetBounds(gfx::Size(6, 8));
     child2->SetDrawsContent(true);
     root->AddChild(std::move(child2));
   }
-  LayerImpl* child2 = root->children()[1];
+  LayerImpl* child2 = root->test_properties()->children[1];
   root->layer_tree_impl()->property_trees()->needs_rebuild = true;
   EmulateDrawingOneFrame(root);
 
   // Damaging two layers simultaneously should cause combined damage.
   // - child1 update rect in surface space: gfx::Rect(100, 100, 1, 2);
   // - child2 update rect in surface space: gfx::Rect(400, 380, 3, 4);
   ClearDamageForAllSurfaces(root);
   child1->SetUpdateRect(gfx::Rect(1, 2));
   child2->SetUpdateRect(gfx::Rect(3, 4));
   root->layer_tree_impl()->property_trees()->needs_rebuild = true;
   EmulateDrawingOneFrame(root);
   gfx::Rect root_damage_rect =
       root->render_surface()->damage_tracker()->current_damage_rect();
   EXPECT_EQ(gfx::Rect(100, 100, 303, 284).ToString(),
             root_damage_rect.ToString());
 }
 
 TEST_F(DamageTrackerTest, VerifyDamageForNestedSurfaces) {
   LayerImpl* root = CreateAndSetUpTestTreeWithTwoSurfaces();
-  LayerImpl* child1 = root->children()[0];
-  LayerImpl* child2 = root->children()[1];
-  LayerImpl* grand_child1 = root->children()[0]->children()[0];
+  LayerImpl* child1 = root->test_properties()->children[0];
+  LayerImpl* child2 = root->test_properties()->children[1];
+  LayerImpl* grand_child1 =
+      root->test_properties()->children[0]->test_properties()->children[0];
   child2->test_properties()->force_render_surface = true;
   grand_child1->test_properties()->force_render_surface = true;
   root->layer_tree_impl()->property_trees()->needs_rebuild = true;
   EmulateDrawingOneFrame(root);
   gfx::Rect child_damage_rect;
   gfx::Rect root_damage_rect;
 
   // CASE 1: Damage to a descendant surface should propagate properly to
   //         ancestor surface.
   ClearDamageForAllSurfaces(root);
@@ skipping 27 matching lines @@
 
 TEST_F(DamageTrackerTest, VerifyDamageForSurfaceChangeFromDescendantLayer) {
   // If descendant layer changes and affects the content bounds of the render
   // surface, then the entire descendant surface should be damaged, and it
   // should damage its ancestor surface with the old and new surface regions.
 
   // This is a tricky case, since only the first grand_child changes, but the
   // entire surface should be marked dirty.
 
   LayerImpl* root = CreateAndSetUpTestTreeWithTwoSurfaces();
-  LayerImpl* child1 = root->children()[0];
-  LayerImpl* grand_child1 = root->children()[0]->children()[0];
+  LayerImpl* child1 = root->test_properties()->children[0];
+  LayerImpl* grand_child1 =
+      root->test_properties()->children[0]->test_properties()->children[0];
   gfx::Rect child_damage_rect;
   gfx::Rect root_damage_rect;
 
   ClearDamageForAllSurfaces(root);
   grand_child1->SetPosition(gfx::PointF(195.f, 205.f));
   root->layer_tree_impl()->property_trees()->needs_rebuild = true;
   EmulateDrawingOneFrame(root);
   child_damage_rect =
           child1->render_surface()->damage_tracker()->current_damage_rect();
   root_damage_rect =
@@ skipping 17 matching lines @@
   // already propagates to the subtree (tested in LayerImpltest), which damages
   // the entire child1 surface, but the damage tracker still needs the correct
   // logic to compute the exposed region on the root surface.
 
   // TODO(shawnsingh): the expectations of this test case should change when we
   // add support for a unique scissor_rect per RenderSurface. In that case, the
   // child1 surface should be completely unchanged, since we are only
   // transforming it, while the root surface would be damaged appropriately.
 
   LayerImpl* root = CreateAndSetUpTestTreeWithTwoSurfaces();
-  LayerImpl* child1 = root->children()[0];
-  LayerImpl* grand_child1 = child1->children()[0];
-  LayerImpl* grand_child2 = child1->children()[1];
+  LayerImpl* child1 = root->test_properties()->children[0];
+  LayerImpl* grand_child1 = child1->test_properties()->children[0];
+  LayerImpl* grand_child2 = child1->test_properties()->children[1];
   gfx::Rect child_damage_rect;
   gfx::Rect root_damage_rect;
 
   ClearDamageForAllSurfaces(root);
   child1->SetPosition(gfx::PointF(50.f, 50.f));
   child1->NoteLayerPropertyChanged();
   grand_child1->NoteLayerPropertyChanged();
   grand_child2->NoteLayerPropertyChanged();
   root->layer_tree_impl()->property_trees()->needs_rebuild = true;
   EmulateDrawingOneFrame(root);
   child_damage_rect =
           child1->render_surface()->damage_tracker()->current_damage_rect();
   root_damage_rect =
           root->render_surface()->damage_tracker()->current_damage_rect();
 
   // The new surface bounds should be damaged entirely.
   EXPECT_EQ(gfx::Rect(190, 190, 16, 18).ToString(),
             child_damage_rect.ToString());
 
   // The entire child1 surface and the old exposed child1 surface should damage
   // the root surface.
   //  - old child1 surface in target space: gfx::Rect(290, 290, 16, 18)
   //  - new child1 surface in target space: gfx::Rect(240, 240, 16, 18)
   EXPECT_EQ(gfx::Rect(240, 240, 66, 68).ToString(),
             root_damage_rect.ToString());
 }
 
 TEST_F(DamageTrackerTest, VerifyDamageForAddingAndRemovingRenderSurfaces) {
   LayerImpl* root = CreateAndSetUpTestTreeWithTwoSurfaces();
-  LayerImpl* child1 = root->children()[0];
+  LayerImpl* child1 = root->test_properties()->children[0];
   gfx::Rect child_damage_rect;
   gfx::Rect root_damage_rect;
 
   // CASE 1: If a descendant surface disappears, its entire old area becomes
   //         exposed.
   ClearDamageForAllSurfaces(root);
   child1->test_properties()->force_render_surface = false;
   root->layer_tree_impl()->property_trees()->needs_rebuild = true;
   EmulateDrawingOneFrame(root);
 
@@ skipping 35 matching lines @@
   root_damage_rect =
           root->render_surface()->damage_tracker()->current_damage_rect();
   EXPECT_EQ(gfx::Rect(190, 190, 16, 18).ToString(),
             child_damage_rect.ToString());
   EXPECT_EQ(gfx::Rect(290, 290, 16, 18).ToString(),
             root_damage_rect.ToString());
 }
 
 TEST_F(DamageTrackerTest, VerifyNoDamageWhenNothingChanged) {
   LayerImpl* root = CreateAndSetUpTestTreeWithTwoSurfaces();
-  LayerImpl* child1 = root->children()[0];
+  LayerImpl* child1 = root->test_properties()->children[0];
   gfx::Rect child_damage_rect;
   gfx::Rect root_damage_rect;
 
   // CASE 1: If nothing changes, the damage rect should be empty.
   //
   ClearDamageForAllSurfaces(root);
   root->layer_tree_impl()->property_trees()->needs_rebuild = true;
   EmulateDrawingOneFrame(root);
   child_damage_rect =
           child1->render_surface()->damage_tracker()->current_damage_rect();
@@ skipping 11 matching lines @@
   child_damage_rect =
           child1->render_surface()->damage_tracker()->current_damage_rect();
   root_damage_rect =
           root->render_surface()->damage_tracker()->current_damage_rect();
   EXPECT_TRUE(child_damage_rect.IsEmpty());
   EXPECT_TRUE(root_damage_rect.IsEmpty());
 }
 
 TEST_F(DamageTrackerTest, VerifyNoDamageForUpdateRectThatDoesNotDrawContent) {
   LayerImpl* root = CreateAndSetUpTestTreeWithTwoSurfaces();
-  LayerImpl* child1 = root->children()[0];
+  LayerImpl* child1 = root->test_properties()->children[0];
   gfx::Rect child_damage_rect;
   gfx::Rect root_damage_rect;
 
   // In our specific tree, the update rect of child1 should not cause any
   // damage to any surface because it does not actually draw content.
   ClearDamageForAllSurfaces(root);
   child1->SetUpdateRect(gfx::Rect(1, 2));
   root->layer_tree_impl()->property_trees()->needs_rebuild = true;
   EmulateDrawingOneFrame(root);
   child_damage_rect =
           child1->render_surface()->damage_tracker()->current_damage_rect();
   root_damage_rect =
           root->render_surface()->damage_tracker()->current_damage_rect();
   EXPECT_TRUE(child_damage_rect.IsEmpty());
   EXPECT_TRUE(root_damage_rect.IsEmpty());
 }
 
 TEST_F(DamageTrackerTest, VerifyDamageForReplica) {
   LayerImpl* root = CreateAndSetUpTestTreeWithTwoSurfaces();
-  LayerImpl* child1 = root->children()[0];
-  LayerImpl* grand_child1 = child1->children()[0];
-  LayerImpl* grand_child2 = child1->children()[1];
+  LayerImpl* child1 = root->test_properties()->children[0];
+  LayerImpl* grand_child1 = child1->test_properties()->children[0];
+  LayerImpl* grand_child2 = child1->test_properties()->children[1];
 
   // Damage on a surface that has a reflection should cause the target surface
   // to receive the surface's damage and the surface's reflected damage.
 
   // For this test case, we modify grand_child2, and add grand_child3 to extend
   // the bounds of child1's surface. This way, we can test reflection changes
   // without changing content_bounds of the surface.
   grand_child2->SetPosition(gfx::PointF(180.f, 180.f));
   {
     std::unique_ptr<LayerImpl> grand_child3 =
@@ skipping 88 matching lines @@
   root_damage_rect =
           root->render_surface()->damage_tracker()->current_damage_rect();
 
   EXPECT_EQ(gfx::Rect(189, 205, 12, 8).ToString(),
             child_damage_rect.ToString());
   EXPECT_EQ(gfx::Rect(289, 305, 12, 8).ToString(), root_damage_rect.ToString());
 }
 
 TEST_F(DamageTrackerTest, VerifyDamageForMask) {
   LayerImpl* root = CreateAndSetUpTestTreeWithOneSurface();
-  LayerImpl* child = root->children()[0];
+  LayerImpl* child = root->test_properties()->children[0];
 
   // In the current implementation of the damage tracker, changes to mask
   // layers should damage the entire corresponding surface.
 
   ClearDamageForAllSurfaces(root);
 
   // Set up the mask layer.
   {
     std::unique_ptr<LayerImpl> mask_layer =
         LayerImpl::Create(host_impl_.active_tree(), 3);
@@ skipping 72 matching lines @@
   // Sanity check that a render surface still exists.
   ASSERT_TRUE(child->render_surface());
 
   child_damage_rect =
           child->render_surface()->damage_tracker()->current_damage_rect();
   EXPECT_EQ(gfx::Rect(30, 30).ToString(), child_damage_rect.ToString());
 }
 
 TEST_F(DamageTrackerTest, VerifyDamageForReplicaMask) {
   LayerImpl* root = CreateAndSetUpTestTreeWithTwoSurfaces();
-  LayerImpl* child1 = root->children()[0];
-  LayerImpl* grand_child1 = child1->children()[0];
+  LayerImpl* child1 = root->test_properties()->children[0];
+  LayerImpl* grand_child1 = child1->test_properties()->children[0];
 
   // Changes to a replica's mask should not damage the original surface,
   // because it is not masked. But it does damage the ancestor target surface.
 
   ClearDamageForAllSurfaces(root);
 
   // Create a reflection about the left edge of grand_child1.
   {
     std::unique_ptr<LayerImpl> grand_child1_replica =
         LayerImpl::Create(host_impl_.active_tree(), 6);
@@ skipping 50 matching lines @@
               current_damage_rect();
   child_damage_rect =
           child1->render_surface()->damage_tracker()->current_damage_rect();
 
   EXPECT_TRUE(grand_child_damage_rect.IsEmpty());
   EXPECT_EQ(gfx::Rect(194, 200, 6, 8).ToString(), child_damage_rect.ToString());
 }
 
 TEST_F(DamageTrackerTest, VerifyDamageForReplicaMaskWithTransformOrigin) {
   LayerImpl* root = CreateAndSetUpTestTreeWithTwoSurfaces();
-  LayerImpl* child1 = root->children()[0];
-  LayerImpl* grand_child1 = child1->children()[0];
+  LayerImpl* child1 = root->test_properties()->children[0];
+  LayerImpl* grand_child1 = child1->test_properties()->children[0];
 
   // Verify that the correct replica_origin_transform is used for the
   // replica_mask.
   ClearDamageForAllSurfaces(root);
 
   // This is not actually the transform origin point being tested, but by
   // convention its
   // expected to be the same as the replica's anchor point.
   grand_child1->test_properties()->transform_origin =
       gfx::Point3F(grand_child1->bounds().width(), 0.f, 0.f);
@@ skipping 41 matching lines @@
   root->layer_tree_impl()->property_trees()->needs_rebuild = true;
   EmulateDrawingOneFrame(root);
 
   gfx::Rect child_damage_rect =
       child1->render_surface()->damage_tracker()->current_damage_rect();
   EXPECT_EQ(gfx::Rect(206, 200, 6, 8).ToString(), child_damage_rect.ToString());
 }
 
 TEST_F(DamageTrackerTest, DamageWhenAddedExternally) {
   LayerImpl* root = CreateAndSetUpTestTreeWithOneSurface();
-  LayerImpl* child = root->children()[0];
+  LayerImpl* child = root->test_properties()->children[0];
 
   // Case 1: This test ensures that when the tracker is given damage, that
   //         it is included with any other partial damage.
   //
   ClearDamageForAllSurfaces(root);
   child->SetUpdateRect(gfx::Rect(10, 11, 12, 13));
   root->render_surface()->damage_tracker()->AddDamageNextUpdate(
       gfx::Rect(15, 16, 32, 33));
   root->layer_tree_impl()->property_trees()->needs_rebuild = true;
   EmulateDrawingOneFrame(root);
@@ skipping 37 matching lines @@
 
   gfx::Rect damage_rect =
       target_surface->damage_tracker()->current_damage_rect();
   EXPECT_TRUE(damage_rect.IsEmpty());
 }
 
 TEST_F(DamageTrackerTest, VerifyDamageAccumulatesUntilReset) {
   // If damage is not cleared, it should accumulate.
 
   LayerImpl* root = CreateAndSetUpTestTreeWithOneSurface();
-  LayerImpl* child = root->children()[0];
+  LayerImpl* child = root->test_properties()->children[0];
 
   ClearDamageForAllSurfaces(root);
   child->SetUpdateRect(gfx::Rect(10.f, 11.f, 1.f, 2.f));
   root->layer_tree_impl()->property_trees()->needs_rebuild = true;
   EmulateDrawingOneFrame(root);
 
   // Sanity check damage after the first frame; this isnt the actual test yet.
   gfx::Rect root_damage_rect =
       root->render_surface()->damage_tracker()->current_damage_rect();
   EXPECT_EQ(gfx::Rect(110, 111, 1, 2).ToString(), root_damage_rect.ToString());
@@ skipping 26 matching lines @@
 
 TEST_F(DamageTrackerTest, HugeDamageRect) {
   // This number is so large that we start losting floating point accuracy.
   const int kBigNumber = 900000000;
   // Walk over a range to find floating point inaccuracy boundaries that move
   // toward the wrong direction.
   const int kRange = 5000;
 
   for (int i = 0; i < kRange; ++i) {
     LayerImpl* root = CreateTestTreeWithOneSurface();
-    LayerImpl* child = root->children()[0];
+    LayerImpl* child = root->test_properties()->children[0];
 
     gfx::Transform transform;
     transform.Translate(-kBigNumber, -kBigNumber);
 
     // The child layer covers (0, 0, i, i) of the viewport,
     // but has a huge negative position.
     child->SetPosition(gfx::PointF());
     child->SetBounds(gfx::Size(kBigNumber + i, kBigNumber + i));
     child->SetTransform(transform);
     root->layer_tree_impl()->property_trees()->needs_rebuild = true;
     EmulateDrawingOneFrame(root);
 
     // The expected damage should cover the visible part of the child layer,
     // which is (0, 0, i, i) in the viewport.
     gfx::Rect root_damage_rect =
         root->render_surface()->damage_tracker()->current_damage_rect();
     gfx::Rect damage_we_care_about = gfx::Rect(i, i);
     EXPECT_LE(damage_we_care_about.right(), root_damage_rect.right());
     EXPECT_LE(damage_we_care_about.bottom(), root_damage_rect.bottom());
   }
 }
 
 }  // namespace
 }  // namespace cc