DCHECK that property tree access is safe in LayerTreeImpl::DidUpdateScrollState

cc/test/push_properties_counting_layer_impl.cc

 // Copyright 2016 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/test/push_properties_counting_layer_impl.h"
 
 namespace cc {
 
 // static
 std::unique_ptr<PushPropertiesCountingLayerImpl>
 PushPropertiesCountingLayerImpl::Create(LayerTreeImpl* tree_impl, int id) {
   return base::WrapUnique(new PushPropertiesCountingLayerImpl(tree_impl, id));
 }
 
 PushPropertiesCountingLayerImpl::PushPropertiesCountingLayerImpl(
     LayerTreeImpl* tree_impl,
     int id)
-    : LayerImpl(tree_impl, id), push_properties_count_(0) {
-  SetBounds(gfx::Size(1, 1));
-}
+    : LayerImpl(tree_impl, id), push_properties_count_(0) {}
 
 PushPropertiesCountingLayerImpl::~PushPropertiesCountingLayerImpl() = default;
 
 void PushPropertiesCountingLayerImpl::PushPropertiesTo(LayerImpl* layer) {
   LayerImpl::PushPropertiesTo(layer);
   push_properties_count_++;
   // Push state to the active tree because we can only access it from there.
   static_cast<PushPropertiesCountingLayerImpl*>(layer)->push_properties_count_ =
       push_properties_count_;
 }
 
 std::unique_ptr<LayerImpl> PushPropertiesCountingLayerImpl::CreateLayerImpl(
     LayerTreeImpl* tree_impl) {
   return PushPropertiesCountingLayerImpl::Create(tree_impl, LayerImpl::id());
 }
 
 }  // namespace cc