Revert of cc: Move data to LayerTree from LayerTreeHost.

ui/compositor/compositor.cc

Index: ui/compositor/compositor.cc
diff --git a/ui/compositor/compositor.cc b/ui/compositor/compositor.cc
index 9fb82223ace78f692846a3c574a84139a2495629..19c43ce2af45fabed5f6895b9bc119b89c107236 100644
--- a/ui/compositor/compositor.cc
+++ b/ui/compositor/compositor.cc
@@ -220,7 +220,7 @@
       cc::AnimationTimeline::Create(cc::AnimationIdProvider::NextTimelineId());
   host_->animation_host()->AddAnimationTimeline(animation_timeline_.get());
 
-  host_->GetLayerTree()->SetRootLayer(root_web_layer_);
+  host_->SetRootLayer(root_web_layer_);
   host_->set_surface_client_id(surface_id_allocator_->client_id());
   host_->SetVisible(true);
 }
@@ -324,8 +324,7 @@
 
 void Compositor::SetHostHasTransparentBackground(
     bool host_has_transparent_background) {
-  host_->GetLayerTree()->set_has_transparent_background(
-      host_has_transparent_background);
+  host_->set_has_transparent_background(host_has_transparent_background);
 }
 
 void Compositor::ScheduleFullRedraw() {
@@ -357,13 +356,13 @@
   DCHECK_GT(scale, 0);
   if (!size_in_pixel.IsEmpty()) {
     size_ = size_in_pixel;
-    host_->GetLayerTree()->SetViewportSize(size_in_pixel);
+    host_->SetViewportSize(size_in_pixel);
     root_web_layer_->SetBounds(size_in_pixel);
     context_factory_->ResizeDisplay(this, size_in_pixel);
   }
   if (device_scale_factor_ != scale) {
     device_scale_factor_ = scale;
-    host_->GetLayerTree()->SetDeviceScaleFactor(scale);
+    host_->SetDeviceScaleFactor(scale);
     if (root_layer_)
       root_layer_->OnDeviceScaleFactorChanged(scale);
   }
@@ -374,7 +373,7 @@
 }
 
 void Compositor::SetBackgroundColor(SkColor color) {
-  host_->GetLayerTree()->set_background_color(color);
+  host_->set_background_color(color);
   ScheduleDraw();
 }