Add protobuf serialization to DisplayItemList

cc/playback/display_item_list_settings.cc

Index: cc/playback/display_item_list_settings.cc
diff --git a/cc/playback/display_item_list_settings.cc b/cc/playback/display_item_list_settings.cc
index c71d9eecc3e82ee546ef3adac536f41a6b9ce7c3..616fc612d7cb2c22b656cc4109257417604d228c 100644
--- a/cc/playback/display_item_list_settings.cc
+++ b/cc/playback/display_item_list_settings.cc
@@ -3,13 +3,23 @@
 // found in the LICENSE file.
 
 #include "cc/playback/display_item_list_settings.h"
+#include "cc/proto/display_item.pb.h"
 
 namespace cc {
 
 DisplayItemListSettings::DisplayItemListSettings()
     : use_cached_picture(false) {}
 
+DisplayItemListSettings::DisplayItemListSettings(
+    const proto::DisplayItemListSettings& proto)
+    : use_cached_picture(proto.use_cached_picture()) {}
+
 DisplayItemListSettings::~DisplayItemListSettings() {
 }
 
+void DisplayItemListSettings::ToProtobuf(
+    proto::DisplayItemListSettings* proto) const {
+  proto->set_use_cached_picture(use_cached_picture);
+}
+
 }  // namespace cc