Refactor MutatorHostClient from LayerTreeHost to LayerTree.

cc/trees/layer_tree_host_unittest_animation.cc

Index: cc/trees/layer_tree_host_unittest_animation.cc
diff --git a/cc/trees/layer_tree_host_unittest_animation.cc b/cc/trees/layer_tree_host_unittest_animation.cc
index 62acaf7088a0107ddd1bbaeac496012daebd0304..22299db09b270e0ee647885985a4ec0051b8a980 100644
--- a/cc/trees/layer_tree_host_unittest_animation.cc
+++ b/cc/trees/layer_tree_host_unittest_animation.cc
@@ -44,7 +44,8 @@ class LayerTreeHostAnimationTest : public LayerTreeTest {
   }
 
   void AttachPlayersToTimeline() {
-    layer_tree_host()->animation_host()->AddAnimationTimeline(timeline_.get());
+    layer_tree_host()->GetLayerTree()->animation_host()->AddAnimationTimeline(
+        timeline_.get());
     layer_tree_host()->SetElementIdsForTesting();
     timeline_->AttachPlayer(player_.get());
     timeline_->AttachPlayer(player_child_.get());
@@ -787,10 +788,12 @@ class LayerTreeHostAnimationTestScrollOffsetAnimationTakeover
       // Add an update after the first commit to trigger the animation takeover
       // path.
       layer_tree_host()
+          ->GetLayerTree()
           ->animation_host()
           ->scroll_offset_animations()
           .AddTakeoverUpdate(scroll_layer_->element_id());
       EXPECT_TRUE(layer_tree_host()
+                      ->GetLayerTree()
                       ->animation_host()
                       ->scroll_offset_animations()
                       .HasUpdatesForTesting());
@@ -848,17 +851,20 @@ class LayerTreeHostAnimationTestScrollOffsetAnimationAdjusted
       // Add an update after the first commit to trigger the animation update
       // path.
       layer_tree_host()
+          ->GetLayerTree()
           ->animation_host()
           ->scroll_offset_animations()
           .AddAdjustmentUpdate(scroll_layer_->element_id(),
                                gfx::Vector2dF(100.f, 100.f));
       EXPECT_TRUE(layer_tree_host()
+                      ->GetLayerTree()
                       ->animation_host()
                       ->scroll_offset_animations()
                       .HasUpdatesForTesting());
     } else if (layer_tree_host()->source_frame_number() == 2) {
       // Verify that the update queue is cleared after the update is applied.
       EXPECT_FALSE(layer_tree_host()
+                       ->GetLayerTree()
                        ->animation_host()
                        ->scroll_offset_animations()
                        .HasUpdatesForTesting());
@@ -1234,7 +1240,8 @@ class LayerTreeHostAnimationTestAnimatedLayerRemovedAndAdded
 
     layer_tree_host()->SetElementIdsForTesting();
 
-    layer_tree_host()->animation_host()->AddAnimationTimeline(timeline_.get());
+    layer_tree_host()->GetLayerTree()->animation_host()->AddAnimationTimeline(
+        timeline_.get());
     timeline_->AttachPlayer(player_.get());
     player_->AttachElement(layer_->element_id());
     DCHECK(player_->element_animations());
@@ -1251,7 +1258,10 @@ class LayerTreeHostAnimationTestAnimatedLayerRemovedAndAdded
             player_->element_animations()->has_element_in_active_list());
         EXPECT_FALSE(
             player_->element_animations()->has_element_in_pending_list());
-        EXPECT_TRUE(layer_tree_host()->animation_host()->NeedsAnimateLayers());
+        EXPECT_TRUE(layer_tree_host()
+                        ->GetLayerTree()
+                        ->animation_host()
+                        ->NeedsAnimateLayers());
         break;
       case 1:
         layer_->RemoveFromParent();
@@ -1259,7 +1269,10 @@ class LayerTreeHostAnimationTestAnimatedLayerRemovedAndAdded
             player_->element_animations()->has_element_in_active_list());
         EXPECT_FALSE(
             player_->element_animations()->has_element_in_pending_list());
-        EXPECT_FALSE(layer_tree_host()->animation_host()->NeedsAnimateLayers());
+        EXPECT_FALSE(layer_tree_host()
+                         ->GetLayerTree()
+                         ->animation_host()
+                         ->NeedsAnimateLayers());
         break;
       case 2:
         layer_tree_host()->root_layer()->AddChild(layer_);
@@ -1267,7 +1280,10 @@ class LayerTreeHostAnimationTestAnimatedLayerRemovedAndAdded
             player_->element_animations()->has_element_in_active_list());
         EXPECT_FALSE(
             player_->element_animations()->has_element_in_pending_list());
-        EXPECT_TRUE(layer_tree_host()->animation_host()->NeedsAnimateLayers());
+        EXPECT_TRUE(layer_tree_host()
+                        ->GetLayerTree()
+                        ->animation_host()
+                        ->NeedsAnimateLayers());
         break;
     }
   }