| Index: cc/test/layer_test_common.cc
 | 
| diff --git a/cc/test/layer_test_common.cc b/cc/test/layer_test_common.cc
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| index 4ba0927d230b2e1fc013c756d83fbee2c3d756b4..0728a5191a09c139fef3fd43caa0b80f27994ffd 100644
 | 
| --- a/cc/test/layer_test_common.cc
 | 
| +++ b/cc/test/layer_test_common.cc
 | 
| @@ -127,6 +127,7 @@ LayerTestCommon::LayerImplTest::LayerImplTest(const LayerTreeSettings& settings)
 | 
|        layer_impl_id_(2) {
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|    std::unique_ptr<LayerImpl> root =
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|        LayerImpl::Create(host_->host_impl()->active_tree(), 1);
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| +  root->SetElementId(NextTestElementId());
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|    host_->host_impl()->active_tree()->SetRootLayer(std::move(root));
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|    root_layer()->SetHasRenderSurface(true);
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|    host_->host_impl()->SetVisible(true);
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| 
 |