cc: Replace LayerIterator with iterator that walks layer list and effect tree

cc/trees/damage_tracker.cc

Index: cc/trees/damage_tracker.cc
diff --git a/cc/trees/damage_tracker.cc b/cc/trees/damage_tracker.cc
index f0aa4c32837b86d74f1b506e3140a01ca8b9a342..aa4a6236801612cd8b4effb572ed9eaa822a27b7 100644
--- a/cc/trees/damage_tracker.cc
+++ b/cc/trees/damage_tracker.cc
@@ -128,8 +128,8 @@ void DamageTracker::UpdateDamageTrackingState(
     gfx::Rect damage_rect;
     bool is_rect_valid = damage_for_this_update.GetAsRect(&damage_rect);
     if (is_rect_valid) {
-      damage_rect = filters.MapRect(
-          damage_rect, target_surface->FiltersTransform().matrix());
+      damage_rect =
+          filters.MapRect(damage_rect, target_surface->SurfaceScale().matrix());
       damage_for_this_update = DamageAccumulator();
       damage_for_this_update.Union(damage_rect);
     }