cc: More consistent reasoning about display list memory usage.

cc/base/sidecar_list_container.h

Index: cc/base/sidecar_list_container.h
diff --git a/cc/base/sidecar_list_container.h b/cc/base/sidecar_list_container.h
index 842795fad1b3a94d2ea644a89c6fbd99301e5e4e..5135ab1d7d2a8a78d48b5a85ed230abacda6cf6c 100644
--- a/cc/base/sidecar_list_container.h
+++ b/cc/base/sidecar_list_container.h
@@ -47,6 +47,7 @@ class SidecarListContainer {
   // Forward most of the reading logic to ListContainer.
   bool empty() const { return list_.empty(); }
   size_t size() const { return list_.size(); }
+  size_t GetCapacityInBytes() const { return list_.GetCapacityInBytes(); }
   ConstIterator begin() const { return list_.begin(); }
   ConstIterator end() const { return list_.end(); }