Implement DrawQuad StructTraits

cc/base/list_container.h

Index: cc/base/list_container.h
diff --git a/cc/base/list_container.h b/cc/base/list_container.h
index 04c7f14a0322bcc03b99d761540f401742beab7a..b34e58805c507ebac68086cf4736320367b9fbbe 100644
--- a/cc/base/list_container.h
+++ b/cc/base/list_container.h
@@ -144,6 +144,11 @@ class ListContainer {
     return result;
   }
 
+  ListContainer& operator=(ListContainer&& other) {
+    helper_.data_.swap(other.helper_.data_);
+    return *this;
+  }
+
   template <typename DerivedElementType>
   void swap(ListContainer<DerivedElementType>& other) {
     helper_.data_.swap(other.helper_.data_);