Enable more layer_tree_host_unittest for LayerTreeHostRemote.

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));
+}
+
+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