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 5ee754ba7605a8b96bd9dd72f266a7b05940ea72..e389836898866a817b4e148cab3d930e83a43aa2 100644
--- a/cc/playback/display_item_list.cc
+++ b/cc/playback/display_item_list.cc
@@ -6,6 +6,7 @@
 
 #include <string>
 
+#include "base/numerics/safe_conversions.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "cc/base/math_util.h"
@@ -204,7 +205,7 @@ DisplayItemList::AsValue() const {
   scoped_refptr<base::trace_event::TracedValue> state =
       new base::trace_event::TracedValue();
 
-  state->SetInteger("length", items_.size());
+  state->SetInteger("length", base::saturated_cast<int>(items_.size()));
   state->BeginArray("params.items");
   for (const DisplayItem* item : items_) {
     item->AsValueInto(state.get());