cc: Fix DisplayScheduler:pending_swaps tracing.

cc/surfaces/display_scheduler.h

Index: cc/surfaces/display_scheduler.h
diff --git a/cc/surfaces/display_scheduler.h b/cc/surfaces/display_scheduler.h
index 83d1300039351fac242795d8842009331cc62fda..4d248194bad4b64ca1c111c55631c98f6788c0f8 100644
--- a/cc/surfaces/display_scheduler.h
+++ b/cc/surfaces/display_scheduler.h
@@ -84,6 +84,7 @@ class CC_SURFACES_EXPORT DisplayScheduler : public BeginFrameObserverBase {
   bool expecting_root_surface_damage_because_of_resize_;
   bool all_active_child_surfaces_ready_to_draw_;
 
+  int next_async_swap_id_;

[reveman, 2017/03/27 16:03:52]

nit: not sure we should have the "async" prefix here as that's a gles2 decoder
concept

[Daniele Castagna, 2017/03/27 16:08:39]

Done.

   int pending_swaps_;
   int max_pending_swaps_;