cc: Add RandomAccessListContainer, which has more restricted API.

cc/base/list_container_helper.h

Index: cc/base/list_container_helper.h
diff --git a/cc/base/list_container_helper.h b/cc/base/list_container_helper.h
index fb953a69456ba73a88893e3176670c357276dd90..31b2310d49dd160441d311fab3d048f40e9a3d76 100644
--- a/cc/base/list_container_helper.h
+++ b/cc/base/list_container_helper.h
@@ -18,6 +18,9 @@ class CC_EXPORT ListContainerHelper final {
   template <typename T>
   friend class ListContainer;
 
+  template <typename T>
+  friend class RandomAccessListContainer;
+
   explicit ListContainerHelper(size_t max_size_for_derived_class);
   ListContainerHelper(size_t max_size_for_derived_class,
                       size_t num_of_elements_to_reserve_for);