Re-land: cc: Use worker context for one-copy tile initialization.

cc/trees/layer_tree_settings.cc

Index: cc/trees/layer_tree_settings.cc
diff --git a/cc/trees/layer_tree_settings.cc b/cc/trees/layer_tree_settings.cc
index 483f86a6adf6e0c75a027bcd4ccd5397d7bbd11f..e11a1bb810b820bb409ce98a4ba83d6cef81ecfb 100644
--- a/cc/trees/layer_tree_settings.cc
+++ b/cc/trees/layer_tree_settings.cc
@@ -73,7 +73,8 @@ LayerTreeSettings::LayerTreeSettings()
       gather_pixel_refs(false),
       use_compositor_animation_timelines(false),
       invert_viewport_scroll_order(false),
-      wait_for_beginframe_interval(true) {}
+      wait_for_beginframe_interval(true),
+      max_staging_buffers(32) {}
 
 LayerTreeSettings::~LayerTreeSettings() {}