cc: Add LayerTreeSetting to disable cached picture raster.

cc/trees/layer_tree_settings.h

Index: cc/trees/layer_tree_settings.h
diff --git a/cc/trees/layer_tree_settings.h b/cc/trees/layer_tree_settings.h
index 2aadbbc90cb4d71c58ea8dfccfebf7180c8186b0..50a02ba866b82f9a5ff21f67e45e14543b224b75 100644
--- a/cc/trees/layer_tree_settings.h
+++ b/cc/trees/layer_tree_settings.h
@@ -90,6 +90,10 @@ class CC_EXPORT LayerTreeSettings {
   int max_staging_buffer_usage_in_bytes;
   ManagedMemoryPolicy memory_policy_;
 
+  // If set to true, the display item list will internally cache a SkPicture for
+  // raster rather than directly using the display items.
+  bool use_cached_picture_raster;
+
   LayerTreeDebugState initial_debug_state;
 };