cc: Move data to LayerTree from LayerTreeHost.

cc/test/fake_layer_tree_host.cc

Index: cc/test/fake_layer_tree_host.cc
diff --git a/cc/test/fake_layer_tree_host.cc b/cc/test/fake_layer_tree_host.cc
index ac270c9b938ba2da9e88f206737a96b229294380..9ee1a24ec285d5301f047d4fb7999819e6c563be 100644
--- a/cc/test/fake_layer_tree_host.cc
+++ b/cc/test/fake_layer_tree_host.cc
@@ -95,13 +95,17 @@ LayerImpl* FakeLayerTreeHost::CommitAndCreateLayerImplTree() {
 
   active_tree()->UpdatePropertyTreeScrollOffset(property_trees());
 
-  if (page_scale_layer() && inner_viewport_scroll_layer()) {
+  if (layer_tree_.page_scale_layer() &&
+      layer_tree_.inner_viewport_scroll_layer()) {
     active_tree()->SetViewportLayersFromIds(
-        overscroll_elasticity_layer() ? overscroll_elasticity_layer()->id()
-                                      : Layer::INVALID_ID,
-        page_scale_layer()->id(), inner_viewport_scroll_layer()->id(),
-        outer_viewport_scroll_layer() ? outer_viewport_scroll_layer()->id()
-                                      : Layer::INVALID_ID);
+        layer_tree_.overscroll_elasticity_layer()
+            ? layer_tree_.overscroll_elasticity_layer()->id()
+            : Layer::INVALID_ID,
+        layer_tree_.page_scale_layer()->id(),
+        layer_tree_.inner_viewport_scroll_layer()->id(),
+        layer_tree_.outer_viewport_scroll_layer()
+            ? layer_tree_.outer_viewport_scroll_layer()->id()
+            : Layer::INVALID_ID);
   }
 
   active_tree()->UpdatePropertyTreesForBoundsDelta();