cc: Use a ListContainer for DisplayItemList to reduce allocations.

cc/resources/largest_display_item.h

Index: cc/resources/largest_display_item.h
diff --git a/cc/resources/largest_display_item.h b/cc/resources/largest_display_item.h
new file mode 100644
index 0000000000000000000000000000000000000000..93a18446b3e169e832f402c98b42150eb670aa9f
--- /dev/null
+++ b/cc/resources/largest_display_item.h
@@ -0,0 +1,17 @@
+// Copyright 2015 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_RESOURCES_LARGEST_DISPLAY_ITEM_H_
+#define CC_RESOURCES_LARGEST_DISPLAY_ITEM_H_
+
+#include "base/basictypes.h"
+#include "cc/base/cc_export.h"
+
+namespace cc {
+
+CC_EXPORT size_t LargestDisplayItemSize();
+
+}  // namespace cc
+
+#endif  // CC_RESOURCES_LARGEST_DISPLAY_ITEM_H_