cc: Use a ListContainer for DisplayItemList to reduce allocations.

cc/quads/list_container.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_QUADS_LIST_CONTAINER_H_
 #define CC_QUADS_LIST_CONTAINER_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
 
 namespace cc {
+class DisplayItem;
+class DrawQuad;
 class SharedQuadState;
-class DrawQuad;
 
 // This class is a container type that handles allocating contiguous memory for
 // new elements and traversing through elements with either iterator or reverse
 // iterator. Since this container hands out raw pointers of its elements, it is
 // very important that this container never reallocate its memory so those raw
 // pointer will continue to be valid.  This class is used to contain
 // SharedQuadState or DrawQuad. Since the size of each DrawQuad varies, to hold
 // DrawQuads, the allocations size of each element in this class is
 // LargestDrawQuadSize while BaseElementType is DrawQuad.
 template <class BaseElementType>
@@ skipping 202 matching lines @@
   void* Allocate(size_t size_of_actual_element_in_bytes);
 
   scoped_ptr<ListContainerCharAllocator> data_;
 
   DISALLOW_COPY_AND_ASSIGN(ListContainer);
 };
 
 #if !defined(COMPILER_MSVC)
 extern template class ListContainer<SharedQuadState>;
 extern template class ListContainer<DrawQuad>;
+extern template class ListContainer<DisplayItem>;
 #endif
 }  // namespace cc
 
 #endif  // CC_QUADS_LIST_CONTAINER_H_