Stop displaying layers with non-invertible transforms.

cc/layers/layer_impl.cc

Index: cc/layers/layer_impl.cc
diff --git a/cc/layers/layer_impl.cc b/cc/layers/layer_impl.cc
index 06981ea89e873c7580df6ab11bdfd875fd79efc4..e9606494dd846da160e8c2aa793bc83958a52567 100644
--- a/cc/layers/layer_impl.cc
+++ b/cc/layers/layer_impl.cc
@@ -62,6 +62,7 @@ LayerImpl::LayerImpl(LayerTreeImpl* tree_impl, int id)
       draws_content_(false),
       hide_layer_and_subtree_(false),
       force_render_surface_(false),
+      transform_is_invertible_(true),
       is_container_for_fixed_position_layers_(false),
       is_3d_sorted_(false),
       background_color_(0),
@@ -517,7 +518,7 @@ void LayerImpl::PushPropertiesTo(LayerImpl* layer) {
   layer->SetShouldFlattenTransform(should_flatten_transform_);
   layer->SetIs3dSorted(is_3d_sorted_);
   layer->SetUseParentBackfaceVisibility(use_parent_backface_visibility_);
-  layer->SetTransform(transform_);
+  layer->SetTransformAndInvertibility(transform_, transform_is_invertible_);
 
   layer->SetScrollClipLayer(scroll_clip_layer_ ? scroll_clip_layer_->id()
                                                : Layer::INVALID_ID);
@@ -995,6 +996,20 @@ void LayerImpl::SetTransform(const gfx::Transform& transform) {
     return;
 
   transform_ = transform;
+  transform_is_invertible_ = transform_.IsInvertible();
+  NoteLayerPropertyChangedForSubtree();
+}
+
+void LayerImpl::SetTransformAndInvertibility(const gfx::Transform& transform,
+                                             bool transform_is_invertible) {
+  if (transform_ == transform) {
+    if (transform_is_invertible_ != transform_is_invertible) {
+      DLOG(ERROR) << "Can't change invertibility if transform is unchanged";

[ajuma, 2014/03/28 18:49:07]

How about a DCHECK instead of a DLOG?

[avallee, 2014/04/15 18:53:25]

Done.

+    }
+    return;
+  }
+  transform_ = transform;
+  transform_is_invertible_ = transform_is_invertible;
   NoteLayerPropertyChangedForSubtree();
 }