cc: Make LayerTreeHost a protected Layer member.

cc/trees/layer_tree_host_common_unittest.cc

 // Copyright 2011 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/trees/layer_tree_host_common.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <memory>
@@ skipping 9525 matching lines @@
                                           std::move(animation));
 
   ExecuteCalculateDrawPropertiesWithPropertyTrees(root.get());
 
   EffectTree& tree = root->GetLayerTree()->property_trees()->effect_tree;
   EffectNode* node = tree.Node(animated->effect_tree_index());
   EXPECT_FALSE(node->is_currently_animating_opacity);
   EXPECT_TRUE(node->has_potential_opacity_animation);
 
   animation_ptr->set_time_offset(base::TimeDelta::FromMilliseconds(0));
-  root->layer_tree_host()->AnimateLayers(
+  root->GetLayerTreeHostForTesting()->AnimateLayers(
       base::TimeTicks::FromInternalValue(std::numeric_limits<int64_t>::max()));
   node = tree.Node(animated->effect_tree_index());
   EXPECT_TRUE(node->is_currently_animating_opacity);
   EXPECT_TRUE(node->has_potential_opacity_animation);
 
   player->AbortAnimations(TargetProperty::OPACITY, false /*needs_completion*/);
   node = tree.Node(animated->effect_tree_index());
   EXPECT_FALSE(node->is_currently_animating_opacity);
   EXPECT_FALSE(node->has_potential_opacity_animation);
 }
@@ skipping 36 matching lines @@
                                           std::move(animation));
 
   ExecuteCalculateDrawPropertiesWithPropertyTrees(root.get());
 
   TransformTree& tree = root->GetLayerTree()->property_trees()->transform_tree;
   TransformNode* node = tree.Node(animated->transform_tree_index());
   EXPECT_FALSE(node->is_currently_animating);
   EXPECT_TRUE(node->has_potential_animation);
 
   animation_ptr->set_time_offset(base::TimeDelta::FromMilliseconds(0));
-  root->layer_tree_host()->AnimateLayers(
+  root->GetLayerTreeHostForTesting()->AnimateLayers(
       base::TimeTicks::FromInternalValue(std::numeric_limits<int64_t>::max()));
   node = tree.Node(animated->transform_tree_index());
   EXPECT_TRUE(node->is_currently_animating);
   EXPECT_TRUE(node->has_potential_animation);
 
   player->AbortAnimations(TargetProperty::TRANSFORM,
                           false /*needs_completion*/);
   node = tree.Node(animated->transform_tree_index());
   EXPECT_FALSE(node->is_currently_animating);
   EXPECT_FALSE(node->has_potential_animation);
@@ skipping 224 matching lines @@
   EXPECT_EQ(scroll_child6.id, grand_child10->scroll_tree_index());
   EXPECT_EQ(scroll_root1.id, parent3->scroll_tree_index());
   EXPECT_EQ(scroll_child7.id, child8->scroll_tree_index());
   EXPECT_EQ(scroll_root1.id, parent4->scroll_tree_index());
   EXPECT_EQ(scroll_root1.id, child9->scroll_tree_index());
   EXPECT_EQ(scroll_root1.id, grand_child12->scroll_tree_index());
 }
 
 }  // namespace
 }  // namespace cc