Remove static thread pointers from CC

cc/layer_tree_host_common_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 "config.h"
 
 #include "cc/layer_tree_host_common.h"
 
 #include "cc/content_layer.h"
 #include "cc/content_layer_client.h"
@@ skipping 767 matching lines @@
     LayerTreeHostCommon::calculateDrawTransforms(parent.get(), parent->bounds(), 1, 1, dummyMaxTextureSize, renderSurfaceLayerList);
     EXPECT_TRUE(parent->renderSurface());
     EXPECT_FALSE(renderSurface1->renderSurface());
     EXPECT_EQ(1U, renderSurfaceLayerList.size());
 }
 
 TEST(LayerTreeHostCommonTest, verifyScrollCompensationForFixedPositionLayerWithDirectContainer)
 {
     // This test checks for correct scroll compensation when the fixed-position container
     // is the direct parent of the fixed-position layer.
-
-    DebugScopedSetImplThread scopedImplThread;
     scoped_ptr<LayerImpl> root = createTreeForFixedPositionTests();
     LayerImpl* child = root->children()[0];
     LayerImpl* grandChild = child->children()[0];
 
     child->setIsContainerForFixedPositionLayers(true);
     grandChild->setFixedToContainerLayer(true);
 
     // Case 1: scrollDelta of 0, 0
     child->setScrollDelta(IntSize(0, 0));
     executeCalculateDrawTransformsAndVisibility(root.get());
@@ skipping 19 matching lines @@
 TEST(LayerTreeHostCommonTest, verifyScrollCompensationForFixedPositionLayerWithTransformedDirectContainer)
 {
     // This test checks for correct scroll compensation when the fixed-position container
     // is the direct parent of the fixed-position layer, but that container is transformed.
     // In this case, the fixed position element inherits the container's transform,
     // but the scrollDelta that has to be undone should not be affected by that transform.
     //
     // Transforms are in general non-commutative; using something like a non-uniform scale
     // helps to verify that translations and non-uniform scales are applied in the correct
     // order.
-
-    DebugScopedSetImplThread scopedImplThread;
     scoped_ptr<LayerImpl> root = createTreeForFixedPositionTests();
     LayerImpl* child = root->children()[0];
     LayerImpl* grandChild = child->children()[0];
 
     // This scale will cause child and grandChild to be effectively 200 x 800 with respect to the renderTarget.
     WebTransformationMatrix nonUniformScale;
     nonUniformScale.scaleNonUniform(2, 8);
     child->setTransform(nonUniformScale);
 
     child->setIsContainerForFixedPositionLayers(true);
@@ skipping 21 matching lines @@
     expectedChildTransform.multiply(nonUniformScale);
 
     EXPECT_TRANSFORMATION_MATRIX_EQ(expectedChildTransform, child->drawTransform());
     EXPECT_TRANSFORMATION_MATRIX_EQ(expectedGrandChildTransform, grandChild->drawTransform());
 }
 
 TEST(LayerTreeHostCommonTest, verifyScrollCompensationForFixedPositionLayerWithDistantContainer)
 {
     // This test checks for correct scroll compensation when the fixed-position container
     // is NOT the direct parent of the fixed-position layer.
-    DebugScopedSetImplThread scopedImplThread;
-
     scoped_ptr<LayerImpl> root = createTreeForFixedPositionTests();
     LayerImpl* child = root->children()[0];
     LayerImpl* grandChild = child->children()[0];
     LayerImpl* greatGrandChild = grandChild->children()[0];
 
     child->setIsContainerForFixedPositionLayers(true);
     grandChild->setPosition(FloatPoint(8, 6));
     greatGrandChild->setFixedToContainerLayer(true);
 
     // Case 1: scrollDelta of 0, 0
@@ skipping 22 matching lines @@
     EXPECT_TRANSFORMATION_MATRIX_EQ(expectedChildTransform, child->drawTransform());
     EXPECT_TRANSFORMATION_MATRIX_EQ(expectedGrandChildTransform, grandChild->drawTransform());
     EXPECT_TRANSFORMATION_MATRIX_EQ(expectedGreatGrandChildTransform, greatGrandChild->drawTransform());
 }
 
 TEST(LayerTreeHostCommonTest, verifyScrollCompensationForFixedPositionLayerWithDistantContainerAndTransforms)
 {
     // This test checks for correct scroll compensation when the fixed-position container
     // is NOT the direct parent of the fixed-position layer, and the hierarchy has various
     // transforms that have to be processed in the correct order.
-    DebugScopedSetImplThread scopedImplThread;
-
     scoped_ptr<LayerImpl> root = createTreeForFixedPositionTests();
     LayerImpl* child = root->children()[0];
     LayerImpl* grandChild = child->children()[0];
     LayerImpl* greatGrandChild = grandChild->children()[0];
 
     WebTransformationMatrix rotationAboutZ;
     rotationAboutZ.rotate3d(0, 0, 90);
 
     child->setIsContainerForFixedPositionLayers(true);
     child->setTransform(rotationAboutZ);
@@ skipping 40 matching lines @@
 }
 
 TEST(LayerTreeHostCommonTest, verifyScrollCompensationForFixedPositionLayerWithMultipleScrollDeltas)
 {
     // This test checks for correct scroll compensation when the fixed-position container
     // has multiple ancestors that have nonzero scrollDelta before reaching the space where the layer is fixed.
     // In this test, each scrollDelta occurs in a different space because of each layer's local transform.
     // This test checks for correct scroll compensation when the fixed-position container
     // is NOT the direct parent of the fixed-position layer, and the hierarchy has various
     // transforms that have to be processed in the correct order.
-    DebugScopedSetImplThread scopedImplThread;
-
     scoped_ptr<LayerImpl> root = createTreeForFixedPositionTests();
     LayerImpl* child = root->children()[0];
     LayerImpl* grandChild = child->children()[0];
     LayerImpl* greatGrandChild = grandChild->children()[0];
 
     WebTransformationMatrix rotationAboutZ;
     rotationAboutZ.rotate3d(0, 0, 90);
 
     child->setIsContainerForFixedPositionLayers(true);
     child->setTransform(rotationAboutZ);
@@ skipping 40 matching lines @@
     EXPECT_TRANSFORMATION_MATRIX_EQ(expectedGrandChildTransform, grandChild->drawTransform());
     EXPECT_TRANSFORMATION_MATRIX_EQ(expectedGreatGrandChildTransform, greatGrandChild->drawTransform());
 }
 
 TEST(LayerTreeHostCommonTest, verifyScrollCompensationForFixedPositionLayerWithIntermediateSurfaceAndTransforms)
 {
     // This test checks for correct scroll compensation when the fixed-position container
     // contributes to a different renderSurface than the fixed-position layer. In this
     // case, the surface drawTransforms also have to be accounted for when checking the
     // scrollDelta.
-    DebugScopedSetImplThread scopedImplThread;
-
     scoped_ptr<LayerImpl> root = createTreeForFixedPositionTests();
     LayerImpl* child = root->children()[0];
     LayerImpl* grandChild = child->children()[0];
     LayerImpl* greatGrandChild = grandChild->children()[0];
 
     child->setIsContainerForFixedPositionLayers(true);
     grandChild->setPosition(FloatPoint(8, 6));
     grandChild->setForceRenderSurface(true);
     greatGrandChild->setFixedToContainerLayer(true);
     greatGrandChild->setDrawsContent(true);
@@ skipping 51 matching lines @@
     EXPECT_TRANSFORMATION_MATRIX_EQ(expectedGrandChildTransform, grandChild->drawTransform());
     EXPECT_TRANSFORMATION_MATRIX_EQ(expectedGreatGrandChildTransform, greatGrandChild->drawTransform());
 }
 
 TEST(LayerTreeHostCommonTest, verifyScrollCompensationForFixedPositionLayerWithMultipleIntermediateSurfaces)
 {
     // This test checks for correct scroll compensation when the fixed-position container
     // contributes to a different renderSurface than the fixed-position layer, with
     // additional renderSurfaces in-between. This checks that the conversion to ancestor
     // surfaces is accumulated properly in the final matrix transform.
-    DebugScopedSetImplThread scopedImplThread;
-
     scoped_ptr<LayerImpl> root = createTreeForFixedPositionTests();
     LayerImpl* child = root->children()[0];
     LayerImpl* grandChild = child->children()[0];
     LayerImpl* greatGrandChild = grandChild->children()[0];
 
     // Add one more layer to the test tree for this scenario.
     {
         WebTransformationMatrix identity;
         scoped_ptr<LayerImpl> fixedPositionChild = LayerImpl::create(5);
         setLayerPropertiesForTesting(fixedPositionChild.get(), identity, identity, FloatPoint(0, 0), FloatPoint(0, 0), IntSize(100, 100), false);
@@ skipping 89 matching lines @@
     EXPECT_TRANSFORMATION_MATRIX_EQ(expectedGreatGrandChildTransform, greatGrandChild->drawTransform());
     EXPECT_TRANSFORMATION_MATRIX_EQ(expectedFixedPositionChildTransform, fixedPositionChild->drawTransform());
 }
 
 TEST(LayerTreeHostCommonTest, verifyScrollCompensationForFixedPositionLayerWithContainerLayerThatHasSurface)
 {
     // This test checks for correct scroll compensation when the fixed-position container
     // itself has a renderSurface. In this case, the container layer should be treated
     // like a layer that contributes to a renderTarget, and that renderTarget
     // is completely irrelevant; it should not affect the scroll compensation.
-    DebugScopedSetImplThread scopedImplThread;
-
     scoped_ptr<LayerImpl> root = createTreeForFixedPositionTests();
     LayerImpl* child = root->children()[0];
     LayerImpl* grandChild = child->children()[0];
 
     child->setIsContainerForFixedPositionLayers(true);
     child->setForceRenderSurface(true);
     grandChild->setFixedToContainerLayer(true);
     grandChild->setDrawsContent(true);
 
     // Case 1: scrollDelta of 0, 0
@@ skipping 25 matching lines @@
     EXPECT_TRANSFORMATION_MATRIX_EQ(expectedSurfaceDrawTransform, child->renderSurface()->drawTransform());
     EXPECT_TRANSFORMATION_MATRIX_EQ(expectedChildTransform, child->drawTransform());
     EXPECT_TRANSFORMATION_MATRIX_EQ(expectedGrandChildTransform, grandChild->drawTransform());
 }
 
 TEST(LayerTreeHostCommonTest, verifyScrollCompensationForFixedPositionLayerThatIsAlsoFixedPositionContainer)
 {
     // This test checks the scenario where a fixed-position layer also happens to be a
     // container itself for a descendant fixed position layer. In particular, the layer
     // should not accidentally be fixed to itself.
-    DebugScopedSetImplThread scopedImplThread;
-
     scoped_ptr<LayerImpl> root = createTreeForFixedPositionTests();
     LayerImpl* child = root->children()[0];
     LayerImpl* grandChild = child->children()[0];
 
     child->setIsContainerForFixedPositionLayers(true);
     grandChild->setFixedToContainerLayer(true);
 
     // This should not confuse the grandChild. If correct, the grandChild would still be considered fixed to its container (i.e. "child").
     grandChild->setIsContainerForFixedPositionLayers(true);
 
@@ skipping 15 matching lines @@
     expectedChildTransform.translate(-10, -10);
     EXPECT_TRANSFORMATION_MATRIX_EQ(expectedChildTransform, child->drawTransform());
     EXPECT_TRANSFORMATION_MATRIX_EQ(expectedGrandChildTransform, grandChild->drawTransform());
 }
 
 TEST(LayerTreeHostCommonTest, verifyScrollCompensationForFixedPositionLayerThatHasNoContainer)
 {
     // This test checks scroll compensation when a fixed-position layer does not find any
     // ancestor that is a "containerForFixedPositionLayers". In this situation, the layer should
     // be fixed to the viewport -- not the rootLayer, which may have transforms of its own.
-    DebugScopedSetImplThread scopedImplThread;
-
     scoped_ptr<LayerImpl> root = createTreeForFixedPositionTests();
     LayerImpl* child = root->children()[0];
     LayerImpl* grandChild = child->children()[0];
 
     WebTransformationMatrix rotationByZ;
     rotationByZ.rotate3d(0, 0, 90);
 
     root->setTransform(rotationByZ);
     grandChild->setFixedToContainerLayer(true);
 
@@ skipping 1351 matching lines @@
 
     // Verify frontFacingSurface's layerList.
     ASSERT_EQ(2u, renderSurfaceLayerList[1]->renderSurface()->layerList().size());
     EXPECT_EQ(frontFacingSurface->id(), renderSurfaceLayerList[1]->renderSurface()->layerList()[0]->id());
     EXPECT_EQ(child1->id(), renderSurfaceLayerList[1]->renderSurface()->layerList()[1]->id());
 }
 
 TEST(LayerTreeHostCommonTest, verifyHitTestingForEmptyLayerList)
 {
     // Hit testing on an empty renderSurfaceLayerList should return a null pointer.
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     std::vector<LayerImpl*> renderSurfaceLayerList;
 
     IntPoint testPoint(0, 0);
     LayerImpl* resultLayer = LayerTreeHostCommon::findLayerThatIsHitByPoint(testPoint, renderSurfaceLayerList);
     EXPECT_FALSE(resultLayer);
 
     testPoint = IntPoint(10, 20);
     resultLayer = LayerTreeHostCommon::findLayerThatIsHitByPoint(testPoint, renderSurfaceLayerList);
     EXPECT_FALSE(resultLayer);
 }
 
 TEST(LayerTreeHostCommonTest, verifyHitTestingForSingleLayer)
 {
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(12345);
 
     WebTransformationMatrix identityMatrix;
     FloatPoint anchor(0, 0);
     FloatPoint position(0, 0);
     IntSize bounds(100, 100);
     setLayerPropertiesForTesting(root.get(), identityMatrix, identityMatrix, anchor, position, bounds, false);
     root->setDrawsContent(true);
 
     std::vector<LayerImpl*> renderSurfaceLayerList;
@@ skipping 20 matching lines @@
     EXPECT_EQ(12345, resultLayer->id());
 
     testPoint = IntPoint(99, 99);
     resultLayer = LayerTreeHostCommon::findLayerThatIsHitByPoint(testPoint, renderSurfaceLayerList);
     ASSERT_TRUE(resultLayer);
     EXPECT_EQ(12345, resultLayer->id());
 }
 
 TEST(LayerTreeHostCommonTest, verifyHitTestingForUninvertibleTransform)
 {
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(12345);
 
     WebTransformationMatrix uninvertibleTransform;
     uninvertibleTransform.setM11(0);
     uninvertibleTransform.setM22(0);
     uninvertibleTransform.setM33(0);
     uninvertibleTransform.setM44(0);
     ASSERT_FALSE(uninvertibleTransform.isInvertible());
 
     WebTransformationMatrix identityMatrix;
@@ skipping 39 matching lines @@
     resultLayer = LayerTreeHostCommon::findLayerThatIsHitByPoint(testPoint, renderSurfaceLayerList);
     EXPECT_FALSE(resultLayer);
 
     testPoint = IntPoint(-1, -1);
     resultLayer = LayerTreeHostCommon::findLayerThatIsHitByPoint(testPoint, renderSurfaceLayerList);
     EXPECT_FALSE(resultLayer);
 }
 
 TEST(LayerTreeHostCommonTest, verifyHitTestingForSinglePositionedLayer)
 {
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(12345);
 
     WebTransformationMatrix identityMatrix;
     FloatPoint anchor(0, 0);
     FloatPoint position(50, 50); // this layer is positioned, and hit testing should correctly know where the layer is located.
     IntSize bounds(100, 100);
     setLayerPropertiesForTesting(root.get(), identityMatrix, identityMatrix, anchor, position, bounds, false);
     root->setDrawsContent(true);
 
     std::vector<LayerImpl*> renderSurfaceLayerList;
@@ skipping 21 matching lines @@
     EXPECT_EQ(12345, resultLayer->id());
 
     testPoint = IntPoint(99, 99);
     resultLayer = LayerTreeHostCommon::findLayerThatIsHitByPoint(testPoint, renderSurfaceLayerList);
     ASSERT_TRUE(resultLayer);
     EXPECT_EQ(12345, resultLayer->id());
 }
 
 TEST(LayerTreeHostCommonTest, verifyHitTestingForSingleRotatedLayer)
 {
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(12345);
 
     WebTransformationMatrix identityMatrix;
     WebTransformationMatrix rotation45DegreesAboutCenter;
     rotation45DegreesAboutCenter.translate(50, 50);
     rotation45DegreesAboutCenter.rotate3d(0, 0, 45);
     rotation45DegreesAboutCenter.translate(-50, -50);
     FloatPoint anchor(0, 0);
     FloatPoint position(0, 0);
     IntSize bounds(100, 100);
@@ skipping 29 matching lines @@
     resultLayer = LayerTreeHostCommon::findLayerThatIsHitByPoint(testPoint, renderSurfaceLayerList);
     ASSERT_FALSE(resultLayer);
 
     testPoint = IntPoint(-1, 50);
     resultLayer = LayerTreeHostCommon::findLayerThatIsHitByPoint(testPoint, renderSurfaceLayerList);
     ASSERT_FALSE(resultLayer);
 }
 
 TEST(LayerTreeHostCommonTest, verifyHitTestingForSinglePerspectiveLayer)
 {
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(12345);
 
     WebTransformationMatrix identityMatrix;
 
     // perspectiveProjectionAboutCenter * translationByZ is designed so that the 100 x 100 layer becomes 50 x 50, and remains centered at (50, 50).
     WebTransformationMatrix perspectiveProjectionAboutCenter;
     perspectiveProjectionAboutCenter.translate(50, 50);
     perspectiveProjectionAboutCenter.applyPerspective(1);
     perspectiveProjectionAboutCenter.translate(-50, -50);
     WebTransformationMatrix translationByZ;
@@ skipping 40 matching lines @@
     // A layer's visibleContentRect is actually in the layer's content space. The
     // screenSpaceTransform converts from the layer's origin space to screen space. This
     // test makes sure that hit testing works correctly accounts for the contents scale.
     // A contentsScale that is not 1 effectively forces a non-identity transform between
     // layer's content space and layer's origin space. The hit testing code must take this into account.
     //
     // To test this, the layer is positioned at (25, 25), and is size (50, 50). If
     // contentsScale is ignored, then hit testing will mis-interpret the visibleContentRect
     // as being larger than the actual bounds of the layer.
     //
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(1);
 
     WebTransformationMatrix identityMatrix;
     FloatPoint anchor(0, 0);
 
     setLayerPropertiesForTesting(root.get(), identityMatrix, identityMatrix, anchor, FloatPoint(0, 0), IntSize(100, 100), false);
 
     {
         FloatPoint position(25, 25);
         IntSize bounds(50, 50);
@@ skipping 40 matching lines @@
     testPoint = IntPoint(74, 74);
     resultLayer = LayerTreeHostCommon::findLayerThatIsHitByPoint(testPoint, renderSurfaceLayerList);
     ASSERT_TRUE(resultLayer);
     EXPECT_EQ(12345, resultLayer->id());
 }
 
 TEST(LayerTreeHostCommonTest, verifyHitTestingForSimpleClippedLayer)
 {
     // Test that hit-testing will only work for the visible portion of a layer, and not
     // the entire layer bounds. Here we just test the simple axis-aligned case.
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     WebTransformationMatrix identityMatrix;
     FloatPoint anchor(0, 0);
 
     scoped_ptr<LayerImpl> root = LayerImpl::create(1);
     setLayerPropertiesForTesting(root.get(), identityMatrix, identityMatrix, anchor, FloatPoint(0, 0), IntSize(100, 100), false);
 
     {
         scoped_ptr<LayerImpl> clippingLayer = LayerImpl::create(123);
         FloatPoint position(25, 25); // this layer is positioned, and hit testing should correctly know where the layer is located.
         IntSize bounds(50, 50);
@@ skipping 46 matching lines @@
     // This test checks whether hit testing correctly avoids hit testing with multiple
     // ancestors that clip in non axis-aligned ways. To pass this test, the hit testing
     // algorithm needs to recognize that multiple parent layers may clip the layer, and
     // should not actually hit those clipped areas.
     //
     // The child and grandChild layers are both initialized to clip the rotatedLeaf. The
     // child layer is rotated about the top-left corner, so that the root + child clips
     // combined create a triangle. The rotatedLeaf will only be visible where it overlaps
     // this triangle.
     //
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(123);
 
     WebTransformationMatrix identityMatrix;
     FloatPoint anchor(0, 0);
     FloatPoint position(0, 0);
     IntSize bounds(100, 100);
     setLayerPropertiesForTesting(root.get(), identityMatrix, identityMatrix, anchor, position, bounds, false);
     root->setMasksToBounds(true);
 
     {
@@ skipping 78 matching lines @@
     testPoint = IntPoint(49, 51);
     resultLayer = LayerTreeHostCommon::findLayerThatIsHitByPoint(testPoint, renderSurfaceLayerList);
     ASSERT_TRUE(resultLayer);
     EXPECT_EQ(2468, resultLayer->id());
 }
 
 TEST(LayerTreeHostCommonTest, verifyHitTestingForNonClippingIntermediateLayer)
 {
     // This test checks that hit testing code does not accidentally clip to layer
     // bounds for a layer that actually does not clip.
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     WebTransformationMatrix identityMatrix;
     FloatPoint anchor(0, 0);
 
     scoped_ptr<LayerImpl> root = LayerImpl::create(1);
     setLayerPropertiesForTesting(root.get(), identityMatrix, identityMatrix, anchor, FloatPoint(0, 0), IntSize(100, 100), false);
 
     {
         scoped_ptr<LayerImpl> intermediateLayer = LayerImpl::create(123);
         FloatPoint position(10, 10); // this layer is positioned, and hit testing should correctly know where the layer is located.
         IntSize bounds(50, 50);
@@ skipping 39 matching lines @@
 
     testPoint = IntPoint(89, 89);
     resultLayer = LayerTreeHostCommon::findLayerThatIsHitByPoint(testPoint, renderSurfaceLayerList);
     ASSERT_TRUE(resultLayer);
     EXPECT_EQ(456, resultLayer->id());
 }
 
 
 TEST(LayerTreeHostCommonTest, verifyHitTestingForMultipleLayers)
 {
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(1);
 
     WebTransformationMatrix identityMatrix;
     FloatPoint anchor(0, 0);
     FloatPoint position(0, 0);
     IntSize bounds(100, 100);
     setLayerPropertiesForTesting(root.get(), identityMatrix, identityMatrix, anchor, position, bounds, false);
     root->setDrawsContent(true);
 
     {
@@ skipping 83 matching lines @@
     ASSERT_TRUE(resultLayer);
     EXPECT_EQ(4, resultLayer->id());
 }
 
 TEST(LayerTreeHostCommonTest, verifyHitTestingForMultipleLayerLists)
 {
     //
     // The geometry is set up similarly to the previous case, but
     // all layers are forced to be renderSurfaces now.
     //
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(1);
 
     WebTransformationMatrix identityMatrix;
     FloatPoint anchor(0, 0);
     FloatPoint position(0, 0);
     IntSize bounds(100, 100);
     setLayerPropertiesForTesting(root.get(), identityMatrix, identityMatrix, anchor, position, bounds, false);
     root->setDrawsContent(true);
 
     {
@@ skipping 525 matching lines @@
     int nonexistentId = -1;
     EXPECT_EQ(root, LayerTreeHostCommon::findLayerInSubtree(root.get(), root->id()));
     EXPECT_EQ(child, LayerTreeHostCommon::findLayerInSubtree(root.get(), child->id()));
     EXPECT_EQ(grandChild, LayerTreeHostCommon::findLayerInSubtree(root.get(), grandChild->id()));
     EXPECT_EQ(maskLayer, LayerTreeHostCommon::findLayerInSubtree(root.get(), maskLayer->id()));
     EXPECT_EQ(replicaLayer, LayerTreeHostCommon::findLayerInSubtree(root.get(), replicaLayer->id()));
     EXPECT_EQ(0, LayerTreeHostCommon::findLayerInSubtree(root.get(), nonexistentId));
 }
 
 } // namespace