cc: Clean up root_layer code in LTI

cc/trees/layer_tree_host_unittest_animation.cc

 // Copyright 2012 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.h"
 
 #include <stdint.h>
 
 #include "cc/animation/animation_curve.h"
 #include "cc/animation/animation_host.h"
@@ skipping 263 matching lines @@
   }
 
   void BeginTest() override {
     PostAddAnimationToMainThreadPlayer(player_child_.get());
   }
 
   void AnimateLayers(LayerTreeHostImpl* host_impl,
                      base::TimeTicks monotonic_time) override {
     // TODO(ajuma): This test only checks the active tree. Add checks for
     // pending tree too.
-    if (!host_impl->active_tree()->root_layer())
+    if (!host_impl->active_tree()->root_layer_for_testing())
       return;
 
     // Wait for the commit with the animation to happen.
     if (host_impl->sync_tree()->source_frame_number() != 0)
       return;
 
     scoped_refptr<AnimationTimeline> timeline_impl =
         host_impl->animation_host()->GetTimelineById(timeline_id_);
     scoped_refptr<AnimationPlayer> player_child_impl =
         timeline_impl->GetPlayerById(player_child_id_);
@@ skipping 708 matching lines @@
 
   void AfterTest() override {
     EXPECT_EQ(final_postion_, scroll_layer_->scroll_offset());
   }
 
  private:
   bool ShouldBlockActivation(LayerTreeHostImpl* host_impl) {
     if (!host_impl->pending_tree())
       return false;
 
-    if (!host_impl->active_tree()->root_layer())
+    if (!host_impl->active_tree()->root_layer_for_testing())
       return false;
 
     scoped_refptr<AnimationTimeline> timeline_impl =
         host_impl->animation_host()->GetTimelineById(timeline_id_);
     scoped_refptr<AnimationPlayer> player_impl =
         timeline_impl->GetPlayerById(player_child_id_);
 
     LayerImpl* scroll_layer_impl =
         host_impl->active_tree()->LayerById(scroll_layer_->id());
     Animation* animation = player_impl->element_animations()->GetAnimation(
@@ skipping 308 matching lines @@
   void SwapBuffersOnThread(LayerTreeHostImpl* host_impl, bool result) override {
     // After both animations have started, verify that they have valid
     // start times.
     if (host_impl->active_tree()->source_frame_number() < 2)
       return;
     AnimationHost::ElementToAnimationsMap element_animations_copy =
         host_impl->animation_host()->active_element_animations_for_testing();
     EXPECT_EQ(2u, element_animations_copy.size());
     for (auto& it : element_animations_copy) {
       int id = it.first;
-      if (id == host_impl->active_tree()->root_layer()->id()) {
+      if (id == host_impl->active_tree()->root_layer_for_testing()->id()) {
         Animation* anim = it.second->GetAnimation(TargetProperty::TRANSFORM);
         EXPECT_GT((anim->start_time() - base::TimeTicks()).InSecondsF(), 0);
       } else if (id == layer_->id()) {
         Animation* anim = it.second->GetAnimation(TargetProperty::OPACITY);
         EXPECT_GT((anim->start_time() - base::TimeTicks()).InSecondsF(), 0);
       }
       EndTest();
     }
   }
 
@@ skipping 307 matching lines @@
     start.AppendTranslate(5.f, 5.f, 0.f);
     TransformOperations end;
     end.AppendTranslate(5.f, 5.f, 0.f);
     AddAnimatedTransformToPlayer(player_.get(), 1.0, start, end);
   }
 
   void BeginTest() override { PostSetNeedsCommitToMainThread(); }
 
   void CommitCompleteOnThread(LayerTreeHostImpl* host_impl) override {
     PropertyTrees* property_trees = host_impl->sync_tree()->property_trees();
-    TransformNode* node = property_trees->transform_tree.Node(
-        host_impl->sync_tree()->root_layer()->transform_tree_index());
+    TransformNode* node =
+        property_trees->transform_tree.Node(host_impl->sync_tree()
+                                                ->root_layer_for_testing()
+                                                ->transform_tree_index());
     gfx::Transform translate;
     translate.Translate(5, 5);
     switch (host_impl->sync_tree()->source_frame_number()) {
       case 2:
         EXPECT_EQ(node->data.local, translate);
         EndTest();
         break;
       default:
         break;
     }
@@ skipping 35 matching lines @@
     AttachPlayersToTimeline();
     player_->AttachElement(layer_tree_host()->root_layer()->id());
     AddAnimatedTransformToPlayer(player_.get(), 1.0, 5, 5);
   }
 
   void BeginTest() override { PostSetNeedsCommitToMainThread(); }
 
   void CommitCompleteOnThread(LayerTreeHostImpl* host_impl) override {
     if (host_impl->pending_tree()->source_frame_number() <= 1) {
       EXPECT_TRUE(host_impl->pending_tree()
-                      ->root_layer()
+                      ->root_layer_for_testing()
                       ->screen_space_transform_is_animating());
     } else {
       EXPECT_FALSE(host_impl->pending_tree()
-                       ->root_layer()
+                       ->root_layer_for_testing()
                        ->screen_space_transform_is_animating());
     }
   }
 
   void DidCommit() override { PostSetNeedsCommitToMainThread(); }
 
   void UpdateLayerTreeHost() override {
     if (layer_tree_host()->source_frame_number() == 2) {
       // Destroy player.
       timeline_->DetachPlayer(player_.get());
       player_ = nullptr;
     }
   }
 
   DrawResult PrepareToDrawOnThread(LayerTreeHostImpl* host_impl,
                                    LayerTreeHostImpl::FrameData* frame_data,
                                    DrawResult draw_result) override {
     const bool screen_space_transform_is_animating =
         host_impl->active_tree()
-            ->root_layer()
+            ->root_layer_for_testing()
             ->screen_space_transform_is_animating();
 
     // Check that screen_space_transform_is_animating changes only once.
     if (screen_space_transform_is_animating &&
         prev_screen_space_transform_is_animating_)
       EXPECT_FALSE(screen_space_transform_animation_stopped_);
     if (!screen_space_transform_is_animating &&
         prev_screen_space_transform_is_animating_) {
       EXPECT_FALSE(screen_space_transform_animation_stopped_);
       screen_space_transform_animation_stopped_ = true;
@@ skipping 68 matching lines @@
  private:
   scoped_refptr<Layer> layer_;
   FakeContentLayerClient client_;
 };
 
 MULTI_THREAD_TEST_F(
     LayerTreeHostAnimationTestRebuildPropertyTreesOnAnimationSetNeedsCommit);
 
 }  // namespace
 }  // namespace cc