Reset property tree indices when layer is removed from layer tree

cc/layers/layer.cc

 // Copyright 2010 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/layers/layer.h"
 
 #include <algorithm>
 
 #include "base/atomic_sequence_num.h"
 #include "base/location.h"
@@ skipping 226 matching lines @@
   return content_rect;
 }
 
 skia::RefPtr<SkPicture> Layer::GetPicture() const {
   return skia::RefPtr<SkPicture>();
 }
 
 void Layer::SetParent(Layer* layer) {
   DCHECK(!layer || !layer->HasAncestor(this));
 
+  transform_tree_index_ = -1;
+  clip_tree_index_ = -1;
+  opacity_tree_index_ = -1;
+
   if (parent_should_know_need_push_properties()) {
     if (parent_)
       parent_->RemoveDependentNeedsPushProperties();
     if (layer)
       layer->AddDependentNeedsPushProperties();
   }
 
   parent_ = layer;
   SetLayerTreeHost(parent_ ? parent_->layer_tree_host() : nullptr);
 
@@ skipping 1257 matching lines @@
 
 void Layer::DidBeginTracing() {
   // We'll be dumping layer trees as part of trace, so make sure
   // PushPropertiesTo() propagates layer debug info to the impl
   // side -- otherwise this won't happen for the the layers that
   // remain unchanged since tracing started.
   SetNeedsPushProperties();
 }
 
 }  // namespace cc