Enable more layer_tree_host_unittest for LayerTreeHostRemote.

cc/test/push_properties_counting_layer_impl.h

+// 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.
+
+#ifndef CC_TEST_PUSH_PROPERTIES_COUNTING_LAYER_IMPL_H_
+#define CC_TEST_PUSH_PROPERTIES_COUNTING_LAYER_IMPL_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "base/memory/ptr_util.h"
+#include "cc/layers/layer_impl.h"
+
+namespace cc {
+
+class LayerTreeImpl;
+
+class PushPropertiesCountingLayerImpl : public LayerImpl {
+ public:
+  static std::unique_ptr<PushPropertiesCountingLayerImpl> Create(
+      LayerTreeImpl* tree_impl,
+      int id);
+  ~PushPropertiesCountingLayerImpl() override;
+
+  // LayerImpl implementation.
+  void PushPropertiesTo(LayerImpl* layer) override;
+  std::unique_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
+
+  size_t push_properties_count() const { return push_properties_count_; }
+  void reset_push_properties_count() { push_properties_count_ = 0; }
+
+ private:
+  PushPropertiesCountingLayerImpl(LayerTreeImpl* tree_impl, int id);
+
+  size_t push_properties_count_;
+
+  DISALLOW_COPY_AND_ASSIGN(PushPropertiesCountingLayerImpl);
+};
+
+}  // namespace cc
+
+#endif  // CC_TEST_PUSH_PROPERTIES_COUNTING_LAYER_IMPL_H_