Reland: cc: Fix size_t to int truncations in layers/ output/ playback/ quads/

cc/playback/display_item_list.cc

Index: cc/playback/display_item_list.cc
diff --git a/cc/playback/display_item_list.cc b/cc/playback/display_item_list.cc
index a0b3e710033e88ea73253a6c0e9ed49950432e33..721d87e3aa714bef1841749ad9d2380175426fd9 100644
--- a/cc/playback/display_item_list.cc
+++ b/cc/playback/display_item_list.cc
@@ -191,7 +191,7 @@ DisplayItemList::AsValue() const {
   scoped_refptr<base::trace_event::TracedValue> state =
       new base::trace_event::TracedValue();
 
-  state->SetInteger("length", items_.size());
+  state->SetInteger("length", static_cast<int>(items_.size()));
   state->BeginArray("params.items");
   for (const DisplayItem* item : items_) {
     item->AsValueInto(state.get());