Stop displaying layers with non-invertible transforms.

cc/layers/layer_unittest.cc

Index: cc/layers/layer_unittest.cc
diff --git a/cc/layers/layer_unittest.cc b/cc/layers/layer_unittest.cc
index f249dfe58947484acc446943c83a2ab098e8fbb1..21cf4d20f3b64184abc8564e7e566b385cf427c3 100644
--- a/cc/layers/layer_unittest.cc
+++ b/cc/layers/layer_unittest.cc
@@ -804,6 +804,37 @@ TEST_F(LayerTest, MaskAndReplicaHasParent) {
   EXPECT_EQ(replica, replica->mask_layer()->parent());
 }
 
+TEST_F(LayerTest, CheckTranformIsInvertible) {
+  scoped_refptr<Layer> layer = Layer::Create();
+  scoped_ptr<LayerImpl> impl_layer =
+      LayerImpl::Create(host_impl_.active_tree(), 1);
+  EXPECT_CALL(*layer_tree_host_, SetNeedsFullTreeSync()).Times(1);
+  EXPECT_CALL(*layer_tree_host_, SetNeedsCommit()).Times(AnyNumber());
+  layer_tree_host_->SetRootLayer(layer);
+
+  EXPECT_TRUE(layer->transform_is_invertible());
+
+  gfx::Transform singular_transform;
+  singular_transform.Scale3d(
+      SkDoubleToMScalar(1.0), SkDoubleToMScalar(1.0), SkDoubleToMScalar(0.0));
+
+  layer->SetTransform(singular_transform);
+  layer->PushPropertiesTo(impl_layer.get());
+
+  EXPECT_FALSE(layer->transform_is_invertible());
+  EXPECT_FALSE(impl_layer->transform_is_invertible());
+
+  gfx::Transform rotation_transform;
+  rotation_transform.RotateAboutZAxis(-45.0);
+
+  layer->SetTransform(rotation_transform);
+  layer->PushPropertiesTo(impl_layer.get());
+  EXPECT_TRUE(layer->transform_is_invertible());
+  EXPECT_TRUE(impl_layer->transform_is_invertible());
+
+  Mock::VerifyAndClearExpectations(layer_tree_host_.get());
+}
+
 class LayerTreeHostFactory {
  public:
   LayerTreeHostFactory()