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 2a2d92b5df59512d8282916a9d0492ea62b1a450..2a583f6bfed23689c9f2c8625e4b9f64e2fa035d 100644
--- a/cc/trees/layer_tree_settings.cc
+++ b/cc/trees/layer_tree_settings.cc
@@ -72,7 +72,8 @@ 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() {}