cc: Plumb gpu/sw image decode limits as layer tree settings.

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 a72346a0f04741e85320a3329600db95d632d7d5..9ef436bf9bbe51c94036ab831b69e179bb6a6149 100644
--- a/cc/trees/layer_tree_settings.h
+++ b/cc/trees/layer_tree_settings.h
@@ -94,6 +94,8 @@ class CC_EXPORT LayerTreeSettings {
   bool use_layer_lists;
   int max_staging_buffer_usage_in_bytes;
   ManagedMemoryPolicy memory_policy_;
+  size_t gpu_decoded_image_budget_bytes;
+  size_t software_decoded_image_budget_bytes;
 
   // If set to true, the display item list will internally cache a SkPicture for
   // raster rather than directly using the display items.