cc: Reland Move data to LayerTree from LayerTreeHost.

cc/test/layer_tree_test.h

Index: cc/test/layer_tree_test.h
diff --git a/cc/test/layer_tree_test.h b/cc/test/layer_tree_test.h
index cba971d88fec07ce836e01039b61d83da93a622f..83819211ad173940c77e8e00110c2fa9d2b807d8 100644
--- a/cc/test/layer_tree_test.h
+++ b/cc/test/layer_tree_test.h
@@ -144,6 +144,7 @@ class LayerTreeTest : public testing::Test, public TestHooks {
   bool TestEnded() const { return ended_; }
 
   LayerTreeHost* layer_tree_host();
+  LayerTree* layer_tree() { return layer_tree_host()->GetLayerTree(); }
   LayerTreeHost* remote_client_layer_tree_host();
   SharedBitmapManager* shared_bitmap_manager() const {
     return shared_bitmap_manager_.get();